Fazlur Rahman said this quote

The successful are those who can be saved from their own selfishness.

~ Fazlur Rahman

The idea behind verses about the sealing of hearts appears to be the psychological law that if a person once does a good or an evil deed, his chances of repeating that kind of action increase and of doing its opposite proportionately decrease. With constant repetition of an evil or of a good action, it becomes almost impossible for a person to do the opposite, or even to think of it, so much so that while men's hearts become sealed and their eyes blinded if they do evil, their doing good produces such a state of mind that the devil himself can have no sway over it. Nevertheless, actions which create a psychological habit, however strong their influence may be, must not be construed as absolute determinants, for there is no point of no return for human behavior: genuine repentance (tauba) can turn an apparently wholly evil man into a paragon of virtue; on the other hand, although this is much more rare, an apparent paragon of virtue (even a prophet!) can turn into a near devil enmeshed in carnal pleasures .

~ Fazlur Rahman

All evil, all injustice, all harm that one does to someone else—in sum, all deviation from man's normative nature—in a much more fundamental way and in a far more ultimate sense one does to oneself, and not just metaphorically but literally.

~ Fazlur Rahman

It must be constantly remembered that the Qu r’ān is not just descriptive but is primarily prescriptive. Both the content of its message and the power of the form in which it is conveyed are designed not so much to inform men in any ordinary sense of the word as to change their character. The psychological impact and the moral import of its statements, therefore, have a primaryrole. Phrases like God has sealed their hearts, blinded their eyes, deafened them to truth” in the Qur’ān do have a descriptive meaning in terms of the psychological processes described earlier; but even more primarily in such contexts, they have a definite psychological intention: to change the ways of men in the right direction.

~ Fazlur Rahman