Rational discussion is useful only when there is a significant base of shared assumptions.
Never put off for tomorrow, what you can do today.
If I speak of myself in different ways, that is because I look at myself in different ways.
It is not enough to have a good mind; the main thing is to use it well.
It is man that makes truth great, not truth that makes man great.
Out of suffering have emerged the strongest souls; the most massive characters are seared with scars.
Yesterday is but today's memory and tomorrow is today's dream.
The use of travelling is to regulate imagination by reality, and instead of thinking how things may be, to see them as they are.
Wisdom is not the product of schooling, but of the lifelong attempt to acquire it.
Every intelligent individual wants to know what makes him tick, and yet is at once fascinated and frustrated by the fact that oneself is the most difficult of all things to know.
Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.
Be realistic: Plan for a miracle
Nobody has the power to take two steps together; you can take only one step at a time.
Better mad with the rest of the world than wise alone.
Share our similarities, celebrate our differences.
I've never known any trouble than an hour's reading didn't assuage.
An understanding of the natural world is a source of not only great curiosity, but great fulfilment.
The only way to get the best of an argument is to avoid it.
The pendulum of the mind oscillates between sense and nonsense, not between right and wrong.
Desire, ignorance, and inequality—this is the trinity of bondage.
Experience keeps a dear school, but fools will learn in no other.