There is nothing more dreadful than the habit of doubt. Doubt separates people. It is a poison that disintegrates friendships and breaks up pleasant relations. It is a thorn that irritates and hurts; it is a sword that kill.

Positive thinking is not about ignoring problems; it's about approaching them with a constructive mindset.

The story of the road behind you, is not the story of the road ahead.

There is nothing so useless as doing efficiently that which should not be done at all.

A book is not an isolated being: it is a relationship.

If learning the truth is the scientist's goal... then he must make himself the enemy of all that he reads.

You cant go back and make a new start, but you can start right now and make a brand new ending.