How can the issue of divine decree (Qada) and destiny (Qadar) be simplified with simple examples and accessible books, and do some aspects of belief in it conflict with reason and logic, or do we merely fail to grasp its wisdom?

The matter of divine decree (Qada’) and destiny (Qadar) does not require examples, for everything in existence is by Allah’s decree and destiny. Belief in it is one of the ranks of faith. Religion does not bring that which contradicts reason, but it may bring that which minds are incapable of comprehending. One should be wary of delving deeply into the issue of divine decree and destiny, for it is one of Allah’s secrets, and researching it may lead to failure.