This is an extract from an article titled "The Ability to See the Signs of God":
In the Quran, God invites people to reject blindly accepting the beliefs and values society imposes on them and to ponder by pushing aside all the prejudices, taboos and constraints on their minds.
Man must think on how he came into being, what is the purpose of his life, why he will die and what awaits him after death. He must question how he himself and the whole universe came into existence and how they continue to exist. While doing this, he must relieve himself of all constraints and prejudices.
By thinking, while isolating his conscience from all social, ideological and psychological obligations, the person should eventually perceive that
the entire universe, including himself, is
created by a superior power. Even when he examines his own body or any other thing in nature, he will see an impressive harmony, plan and wisdom at work within its design.
At this point again, the Quran guides man. In the Quran, God guides us as to what we should
reflect on and investigate. With the methods of reflection given in the Quran, he who has faith in God will better perceive God's perfection, eternal wisdom, knowledge and power in His creation. When a believing person starts to think in the way shown in the Quran, he soon realizes that the whole universe is a sign of God's power and art, and that, "nature is a work of art, not the artist itself". Every work of art exhibits the exceptional skills of the one who has made it and conveys his messages.
In the Quran, people are summoned to contemplate numerous events and objects that clearly testify to the existence and uniqueness of God and His attributes. In the Quran, all these beings that bear witness are designated as "
signs", meaning "tested evidence, absolute knowledge and expression of truth". Therefore, the signs of God comprise all the beings in the universe that disclose and communicate the being and attributes of God. Those who can observe and remember will see that the entire universe is only composed of the signs of God.
This, indeed, is the responsibility of mankind; to be able to see the signs of God... Thus, such a person will come to know the Creator who created him and all other things, draw closer to Him, discover the meaning of his existence and his life and so prosper.
http://www.islamicity.com/articles/Articles.asp?ref=IC0406-2351
All the best.