Ability is not something to ...

Ability is not something to be saved, like money, in the hope that you can draw interest on it. The interest comes from the spending. Unused ability, like unused muscles, will atrophy. It is tragic to realize that the majority of human beings, even the so-called educated, call upon only the smallest fraction of their potential capacity. They leave many talents dormant. They fail to develop their mental qualities. They are almost unaware of the degree of energy upon which they might call to build a full and rewarding life.
Ability is not something to be saved, like money, in the hope that you can draw interest on it. The interest comes from the spending. Unused ability, like unused muscles, will atrophy. It is tragic to realize that the majority of human beings, even the so-called educated, call upon only the smallest fraction of their potential capacity. They leave many talents dormant. They fail to develop their mental qualities. They are almost unaware of the degree of energy upon which they might call to build a full and rewarding life.

Quotes from the same author

One's philosophy is not best expressed in words; it is expressed in the choices one makes... and the choices we make are ultimately our responsibility.
Remember always that you not only have the right to be an individual, you have an obligation to be one.
Friendship with oneself is all important because without it one cannot be friends with anybody else in the world.
With the new day comes new strength and new thoughts.
No one can make you feel inferior without your consent.