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"Verily the likeness of (this) worldly life is as the water (rain) which We send down from the sky, so by it arises the intermingled produce of the earth of which men and cattle eat until when the earth is clad with its adornments and is beautified, and its people think that they have all the powers of disposal over it, Our Command reaches it by night or by day and We make it like a clean-mown harvest, as if it had not flourished yesterday! Thus do We explain the Ayaat (proofs, evidences, verses, lessons, signs, revelations, laws, etc.) in detail for the people who reflect." [Yoonus (10):24]

Narrated An-Nu'man bin Bashir:

I heard Allah's Apostle saying, 'Both legal and illegal things are evident but in between them there are doubtful (suspicious) things and most of the people have no knowledge about them. So whoever saves himself from these suspicious things saves his religion and his honor. And whoever indulges in these suspicious things is like a shepherd who grazes (his animals) near the Hima (private pasture) of someone else and at any moment he is liable to get in it. (O people!) Beware! Every king has a Hima and the Hima of Allah on the earth is His illegal (forbidden) things. Beware! There is a piece of flesh in the body if it becomes good (reformed) the whole body becomes good but if it gets spoilt the whole body gets spoilt and that is the heart. [The Book of Faith Volume 1, Book 2, Hadeeth 49]