"A good illustration of this appears among the stories of the life of the Lord Buddha. A man came to him one day, as people in trouble were wont to do, and told him that he had great difficulty with his meditation, which he could scarcely succeed in doing at all. Then the Buddha told him that there was a very simple reason for it—that in a previous life he had foolishly been in the habit of annoying certain holy men and disturbing their meditations. Yet that man may have been more advanced as an ego than some of his companions whose meditations were well done."
January 1, 1970
https://en.wikiquote.org/wiki/The_Masters_and_the_Path