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

Let no man pull you low enough to hate him.

When I stand before God at the end of my life, I would hope that I would not have a single bit of talent left, and could say, 'I used everything you gave me'.

Wisdom is not the product of schooling, but of the lifelong attempt to acquire it.

Doubt is the origin of wisdom

Those who cannot work with their hearts achieve but a hollow, half-hearted success that breeds bitterness all around.

The future is uncertain but the end is always near.

Work is the price which is paid for reputation.

Stubborn and ardent clinging to one's opinion is the best proof of stupidity.

It seems essential, in relationships and all tasks, that we concentrate only on what is most significant and important.

Circumstances do not make a man, they reveal him.

Turn your wounds into wisdom.

Drop the idea that you are Atlas carrying the world on your shoulders. The world would go on even without you. Don't take yourself so seriously.

Proverbs are short sentences drawn from long experience.

Every aquarium will eventually leak.

To be wronged is nothing unless you continue to remember it.

If you would take, you must first give, this is the beginning of intelligence.

Learning and wisdom are superfluities, the surface glitter merely, but it is the heart that is the seat of all power.

I've come to believe that all my past failure and frustration were actually laying the foundation for the understandings that have created the new level of living I now enjoy.

True knowledge lies in knowing how to live.

Thoughts without content are empty, intuitions without concepts are blind.