Perpetual emotion is the past time of the undisciplined mind.

There is one recurring, persistent, perennial, and dogging personal problem which, more than any other, steals the force and peace of people and ruins projects and enterprises and careers. It is the habit of feeling hurt, because of what others do, or do not do and what they say or do not say

The unorganized mind will always be restless until its content is reordered.

You may have a beautiful philosophy, you may have lofty ideals, but what you will do with your philosophy and ideals is dependent entirely upon what you are inside yourself

It is not what is happening to you but rather what is happening in you that determines whether you succeed or fail.