If you want the present to be different from the past, study the past.

Necessity is the mother of invention.

If one cannot enjoy reading a book over and over again, there is no use in reading it at all.

Patience is a virtue, and I'm learning patience. It's a tough lesson.

Real knowledge is to know the extent of one's ignorance.

It is possible to fly without motors, but not without knowledge and skill.

The ability to observe without evaluating is the highest form of intelligence.

Courage, conviction and confidence.

Never help a child with a task at which he feels he can succeed.

The secret of life is not enjoyment but education through experience.

Education is the most powerful weapon which you can use to change the world.

Knowledge, Action, Devotion are complementary to each other.

The delight of opening a new pursuit, or a new course of reading, imparts the vivacity and novelty of youth even to old age.

The real solution lies in a world in which charity will have become unnecessary.

Physics is like sex: sure, it may give some practical results, but that's not why we do it.

Free the child's potential, and you will transform him into the world.

I cannot live without books.

There is no authority who decides what is a good idea.

Science is a way of thinking much more than it is a body of knowledge.

Just because I don't care doesn't mean I don't understand.

The white man is very clever. He came quietly and peaceably with his religion. We were amused at his foolishness and allowed him to stay. Now he has won our brothers, and our clan can no longer act like one. He has put a knife on the things that held us together and we have fallen apart.