It is said that Plato was known for his knowledge of intellect. He posted a doorkeeper at his gate who was ordered to describe any individual who wished to see him. Plato would then judge the morals of the individual based on the description provided to him and decide whether or not to grant an audience based on his judgment of the individual’s description.
A person arrived for an audience with Plato, and the door keeper provided the man’s description to him. Plato refused to meet him after reviewing the visitor’s description. The man asked the doorkeeper to tell Plato that he was right in his interpretation of him; however, he had changed his natural disposition by the power of self-abnegation. Plato granted him an audience.
Thus, the natural disposition is such a thing that can be changed.
(Malfuzat, Vol. 7, p. 128–129)