Gravity is only the bark of wisdom's tree; but it preserves it

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

The experience gathered from books, though often valuable,is but the nature of learning whereas the experience gained from actual life is of the nature of wisdom.

Medicine heals diseases of the body, wisdom frees the soul from passions.

He who chooses the beginning of the road chooses the place it leads to.

Reality leaves a lot to the imagination.

Science may set limits to knowledge, but should not set limits to imagination.

Wrong life cannot be lived rightly.

Peace is not an absence of war, it is a virtue, a state of mind, a disposition for benevolence, confidence, justice.

I know I am but mortal and so therewhilst prepare myself for death, whensoever it shall please God to send it.

Tomorrow hopes we have learned something from yesterday.

Rational discussion is useful only when there is a significant base of shared assumptions.

The wise man should restrain his senses like the crane and accomplish his purpose with due knowledge of his place, time and ability.

Those who see the invisible can do the impossible.

Adapt what is useful, reject what is useless, and add what is specifically your own.

Life's battles don't always go to the stronger or faster man. But sooner or later, the man who wins is the man who thinks he can.

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.

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

It’s your road and yours alone. Others may walk it with you, but no one can walk it for you.

What's done can't be undone.

Courage is resistance to fear, mastery of fear - not absence of fear.