Nature does nothing uselessly.

Those that know, do. Those that understand, teach.

A friend to all is a friend to none.

What it lies in our power to do, it lies in our power not to do.

Courage is the first of human qualities because it is the quality which guarantees the others.

Good habits formed at youth make all the difference.

Moral excellence comes about as a result of habit. We become just by doing just acts, temperate by doing temperate acts, brave by doing brave acts.

We are what we repeatedly do. Excellence, then, is not an act, but a habit.

Man is a goal-seeking animal. His life only has meaning if he is reaching out and striving for his goals

The least initial deviation from the truth is multiplied later a thousandfold.

Poverty is the parent of revolution and crime.

We give up leisure in order that we may have leisure, just as we go to war in order that we may have peace.

Happiness is the meaning and the purpose of life: the whole aim and end of human existence.

Happiness is an expression of the soul in considered actions.

No happy man can become miserable, for he will never do acts that are hateful and mean.

It is possible to fail in many ways…while to succeed is possible only in one way.

To be conscious that we are perceiving or thinking is to be conscious of our own existence.

We cannot learn without pain.

Happiness is a state of activity.