How did the First Human Sin Happen?

It is often wondered how the first human sin came into the world.  How did sin come from Adam’s holy soul?  Did he have free-will in the matter, or was he necessitated to do what he did?  Could he have done otherwise?  What were his motives, and did sinful desires precede his eating of the forbidden fruit?

Your questions are about to be answered to your full satisfaction.  See here:

How did the First Human Sin Happen?