Arithmetic is a kind of knowledge in which the best natures should be trained, and which must not be given up.

Human behavior flows from three main sources: desire emotion and knowledge.

Science is nothing but perception.

Reality is created by the mind. We can change our reality by changing our mind.

If you do not take an interest in the affairs of your government, then you are doomed to live under the rule of fools.

A wise man speaks because he has something to say; a fool because he has to say something.

No one is more hated than he who speaks the truth.

Don't force your children into your ways, for they were created for a time different from your own.

Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws.

Reality is created by the mind, we can change our reality by changing our mind.

Enjoy life. There's plenty of time to be dead. Be kind, for everyone you meet is fighting a harder battle.

As for time, all men have it in abundance.

Physical training is mental warfare!

Every man has his secret desire, I suppose, and mine is someday to own a farm.

I didn't want to let women down. One of the stereotypes I see breaking is the idea of aging and older women not being beautiful.

I believe success is preparation, because opportunity is going to knock on your door sooner or later but are you prepared to answer that?

I appear as a skeptic, who believes that doubt is the great engine, the great fuel of all inquiry, all discovery and all innovation.

The truth is... everything counts. Everything. Everything we do and everything we say. Everything helps or hurts; everything adds to or takes away from someone else.

There's no country in the world that's more devastated from natural resources than Afghanistan.

It is the intelligent and highly educated that agonize over their limitations.

Writing for adults often means just increasing the swearing - but find an alternative to swearing and you've probably got a better line.