Everything
is a Mirror to God: Consider the sun. From the planets to drops of
water, to fragments of glass and sparkling snow-flakes, a brilliant effect
particular to the sun is apparent. If you do not accept the tiny suns
apparent in these innumerable 
things to be the manifestations of the sun's
reflection, then you will have to admit the absurdity of accepting
the actual existence of a sun in each drop of water, and in each fragment
of glass and transparent object facing the light of the sun. If the images
or reflections of the sun in drops of water and fragments of glass and
various colors in flowers are not attributed to the sun, then it will be
necessary to accept the existence of innumerable suns in place of the one
sun, which is a completely inconceivable superstition. In just the same way,
if everything in the universe is not attributed to One God, it will be
necessary to accept, in place of One God, as many gods as the particles in
the universe. This will mean falling to the degree of accepting a
hundred-fold inconceivability.
Finality
in Creation: Nothing in the universe is pointless. As ecology in
particular shows, everything in creation, no matter how apparently
insignificant, has a very significant role in existence and serves a
certain purpose. 
The chain of creation up to man, the last link in
creation, is evidently directed to a final purpose. Just as the purpose
for growing a fruit-bearing tree is to obtain fruits and the life of that
tree is directed toward the fruit, so too the 'tree of creation' has yielded as its final and most comprehensive fruit. So, nothing is in vain in the universe. There are many purposes for every thing, every activity, and every event in it. Since this requires a wise one who pursues certain purposes in creation, and since nothing in the world-except for man-has the consciousness to pursue those purposes, the wisdom
in creation necessarily point to God.
Mercy: All living and even non-living beings are in continuous need of many things, even a small portion of which they are unable to supply by themselves. For example, the operation and maintenance of the universe demand the existence of certain universal laws, such as growth, reproduction, gravitation and repulsion. However, these laws, which we call 'natural laws', have no external, visible or material existence; they exist nominally. Something with a nominal existence only, which has no knowledge and consciousness, can evidently not be responsible for a miraculous creation, which requires absolute power and absolute knowledge, wisdom, and power of choice and preference. So, one who has all these attributes has established these 'natural laws' and uses them as veils before His operations for a certain purpose.
Also, plants need air, water, heat and light for their life, none of which they are able to meet by themselves. As for the needs of man, they are too many to enumerate. Fortunately, all his essential needs, from the very beginning of his earthly existence in his mother's womb to his death, are met beyond his own capacity and intervention.
When he enters into the world, he finds everything prepared to meet all the needs of his senses and intellectual and spiritual faculties. This clearly shows that one who is infinitely merciful and knowledgeable provides for all created beings in the most extraordinary way and causes all things to collaborate to that end.
Orderliness in Creation: From tiniest particles to huge spheres and galaxies, everything in the universe and the universe as a whole display a magnificent harmony and order. Not only in things themselves but also between all things there is a harmonious relation, so much so that as the existence of a single part necessitates the existence of the whole, so also the whole requires the existence of all its parts for its existence. The deformation of a single cell may lead to the death of a whole body; similarly a single pomegranate demands for its existence the collaborative and cooperative existence of air, water, earth, and the sun and a well-balanced cooperation between them. This harmony and cooperation in the universe point to a creator of order, who knows everything in all its relations and with all its characteristics, and who is able to put everything in order. That creator of order is God.
Artistry in Creation: The whole of the creation exhibits an overwhelming artistry of dazzling worth. Yet it is brought into being, as we see it, easily and in a very short time. Furthermore, creation is divided into countless families, and species and even smaller groups, and each of these exists in great abundance.
Despite the variety and abundance, we see only orderliness and art and ease in creation. This shows the existence of one with an absolute power and knowledge, who is God.
Contingent Nature of Creation: Whether as a whole or separately, all things are contingent, that is, it is equally possible for something to come into existence or not. Also, it is possible for any thing to come into existence at any time, in any place and in any form and with any character. We see that nothing or nobody in the world, whether conscious or unconscious, living or non-living, has any role to determine the way, and the date and place of its coming into existence, and its character and features. So, there must be some power that chooses between the existence and non-existence of any particular thing and gives it its distinguishing, individual characteristics. This power must be infinite, have absolute will and all-comprehensive knowledge. Necessarily, this power is God.
Finite Nature of Things: Everything in the universe is changeable. Anything changeable is contained by time and space; it has a beginning and end. Anything which has a beginning needs a without beginning one who brings it into existence. For the one who has a beginning cannot be the originator of things, since such a one will, evidently, need another originator. As an unending regress through the originator of each originator, is unacceptable, reason demands one who is infinitely self-existent and self-subsistent, who undergoes no change, namely God.
Cleanliness
in Nature: Until recently, when human beings began to over-pollute air, water and earth, the natural world has been continually cleansed and purified. Even now, it still preserves
its original purity in many regions, mostly where the ways of modern life have not yet taken hold. Have you ever considered why nature is so clean, why forests, for example, are so clean although many animals die there every day? Have you ever considered if the flies born in a single season of summer were all to survive, the face of the earth would be covered with many layers of fly bodies? Have you ever reflected on the fact that nothing is wasted in nature? Every dying is the beginning of a new birth. For example, a dead body is decomposed and integrated into earth. Elements die to be revived in plants; plants die in the stomachs of animals and human beings to be promoted to the higher rank of life.
This cycle of death and revival is one of the factors, which maintain the cleanliness, and purity of the universe. As well as bacteria and insects, the winds and rain, and
oxygen in organic bodies, all serve to sustain the purity in the universe. This purity points to one whose attributes include cleanliness and purity