The fourfold root of the principle of sufficent reason is "Anything perceived has a cause. All conclusions have premises. All effects have causes. All actions have motives.

All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident.

It is difficult to find happiness within oneself, but it is impossible to find it anywhere else.

The majority of men... are not capable of thinking, but only of believing, and... are not accessible to reason, but only to authority.

Talent hits a target no one else can hit; Genius hits a target no one else can see.

A man can be himself only so long as he is alone; and if he does not love solitude, he will not love freedom; for it is only when he is alone that he is really free.

Man is the only animal who causes pain to others with no other object than wanting to do so.

Genius and madness have something in common: both live in a world that is different from that which exists for everyone else.

A pessimist is an optimist in full possession of the facts.

Religions are like fireflies. They require darkness in order to shine.

Nature shows that with the growth of intelligence comes increased capacity for pain, and it is only with the highest degree of intelligence that suffering reaches its supreme point.

Tom. Tom, look at me. Has Nora agreed to marry you?""No, but she will because she has to.

Do not try to understand love, rather, stand in love and observe what happens around you.

And you can shove your apology. If it can come out of your damned mouth, then you can stand by it.

I feel wonderful and sad. It's the gin.

When you get to know me, I don't despair - I just get up, clean up, and start again.

A security system is only as secure as its secret. Beware of pseudo-secrets.

Power is something that is abused. I suppose use and abuse are in the eye of the beholder.

We want to believe we couldn't be replaced, and that the people we love are irreplaceable.

If you do something long enough, you uncover life lessons along the way.

There is no escape from yesterday because yesterday has deformed us, or been deformed by us. The mood is of no importance. Deformation has taken place.