Every person is a rightful heir to the Truth. But he who would inherit it must be spiritually prepared for it, and this spiritual preparation sometimes takes several lives of patient
and persistent effort. Therefore, one of the first requirements of the aspirant is that he should combine unfailing enthusiasm with unyielding patience.
Once an individual is determined to realize the Truth, he finds that his path is beset with many difficulties, and there are very few who persist with steady courage till the very end. It is easy to give up the effort when one is confronted with obstacles.
Discourses-7th. ed. P-.355-356