Most of us can learn to live ...

Most of us can learn to live in perfect comfort on higher levels of power. Everyone knows that on any given day there are energies slumbering in him which the incitements of that day do not call forth. Compared with what we ought to be, we are only half awake. It is evident that our organism has stored-up reserves of energy that are ordinarily not called upon - deeper and deeper strata of explosible material, ready for use by anyone who probes so deep. The human individual usually lives far within his limits.
Most of us can learn to live in perfect comfort on higher levels of power. Everyone knows that on any given day there are energies slumbering in him which the incitements of that day do not call forth. Compared with what we ought to be, we are only half awake. It is evident that our organism has stored-up reserves of energy that are ordinarily not called upon - deeper and deeper strata of explosible material, ready for use by anyone who probes so deep. The human individual usually lives far within his limits.

Quotes from the same author

Most people never run far enough on their first wind to find out they've got a second.
To change one's life, start immediately, do it flamboyantly, no exceptions.
The greatest discovery of our generation is that human beings can alter their lives by altering their attitudes of mind. As you think, so shall you be.
The deepest craving of human nature is the need to be appreciated.
Pretend what we may, the whole man within us is at work when we form our philosophical opinions.