God of Islam Visible in nature and Perceived by Human Hearts
The Being of God is transcendental and beyond the beyond and is most secret and cannot be discovered by the power of human reasoning alone. No argument can prove it conclusively; inasmuch as reason can travel only so far that contemplating the universe, it feels the need of a Creator. But the feeling of a need is one thing and it is quite another to arrive at the certainty that the God, Whose need has been felt, does in fact exist. As the operation of reason is defective, incomplete and doubtful, a philosopher cannot recognise God purely through reason. Most people who try to determine the existence of God Almighty purely through the exercise of reason, in the end, become atheists. Reflecting over the creation of the heavens and the earth does not avail them much and they begin to deride and laugh at the men of God. One of their arguments is that there are thousands of things in the world which have no use and the fashioning of which does not indicate the existence of a fashioner. They exist merely as vain and useless things. These people do not seem to realise that lack of knowledge of something does not necessarily negate its existence.
There are millions of people in the world who regard themselves as very wise philosophers and who utterly deny the existence of God. It is obvious that if they had discovered a strong reason for the existence of God, they would not have denied it. If they had discovered a conclusive argument in support of the existence of God, they would not have rejected it shamelessly and in derision. It is obvious, therefore, that no one boarding the ark of the philosophers can find deliverance from the storm of doubts but instead is bound to be drowned; and such a one would never have access to the drinking of pure Unity. 
 Haqiqat-ul-Wahi, Ruhani Khaza’in, Vol. 22, pp. 120-121, (Eng. Translation, The Essence of Islam, Vol. 1, p.40)