The preoccupations of daily life combined with our weakness in our moral will obscure our inherent light. In recognition of these two realities, and to alleviate their influence on our moral development, God has strengthened our natural light with that of Revelation. Thus, God has made it an obligation upon Himself to instruct men before calling them to account.
Morality in the Quran
And (remember) when your Lord brought forth from the Children of Adam, from their loins, their seed (or from Adam’s loin his offspring) and made them testify as to themselves (saying): “Am I not your Lord?” They said: “Yes! We testify,” lest you should say on the Day of Resurrection: “Verily, we have been unaware of this.”
Quran 7:172 (Mohsin Khan translation)
Ahmed Eltawil 