The principle of sufficient reason states that anything that happens does so for a reason: no state of affairs can obtain, and no statement can be true unless there is sufficient reason why it should not be otherwise.
Sufficient reason. “There must be a sufficient reason [often known only to God] for anything to exist, for any event to occur, for any truth to obtain.”
The key thing about logic, is knowing the assumption. The foundation of logic is in the assumptions. Without assumptions, logic cannot commence.
The principle of sufficient reason trivially holds because we can start from any assumption, to explain anything.