Procrastination is hardly more evil than grasping impatience.

Sincerity is the indispensable ground of all conscientiousness, and by consequence of all heartfelt religion.

Two things fill the mind with ever new and increasing admiration and awe, the oftener and more steadily we reflect on them: the starry heavens above me and the moral law within me.

When I could have used a wife, I could not support one; and when I could support one, I no longer needed any

An action, to have moral worth, must be done from duty.

Reason in a creature is a faculty of widening the rules and purposes of the use of all its powers far beyond natural instinct; it acknowledges no limits to its projects. Reason itself does not work instinctively, but requires trial, practice, and instruction in order gradually to progress from one level of insight to another.

Genius is the ability to independently arrive at and understand concepts that would normally have to be taught by another person.