In poverty and other misfortunes of life, true friends are a sure refuge. The young they keep out of mischief; to the old they are a comfort and aid in their weakness, and those in the prime of life they incite to noble deeds.

The ultimate authority must always rest with the individual's own reason and critical analysis.

Those who educate children well are more to be honored than they who produce them; for these only gave them life, those the art of living well.

Logic will get you from A to B. Imagination will take you everywhere.

Three can keep a secret, if two of them are dead. 

Love is composed of a single soul inhabiting two bodies.

Gentleness, self-sacrifice and generosity are the exclusive possession of no one race or religion.

Heaven and earth represent the carrot and stick theory of management in religious philosophy.

Follow the path of the unsafe, independent thinker. Expose your ideas to the danger of controversy. Speak your mind and fear less the label of 'crackpot' than the stigma of conformity. 

Religion is a matter of faith. Science has to face challenges at every step.

Science creates scientists...who creates godmen?

If you want to make peace with your enemy, you have to work with your enemy. Then he becomes your partner.