To be conscious that you are ignorant of the facts is a great step to knowledge.

Only passions, great passions can elevate the soul to great things.

There is no pain so great as the memory of joy in present grief.

After climbing a great hill, one only finds that there are many more hills to climb.

That some achieve great success, is proof to all that others can achieve it as well.

Most people say that it is the intellect which makes a great scientist. They are wrong: it is character.

The great thing in the world is not so much where we stand, as in what direction we are moving.

A great pleasure in life is doing what people say you cannot do.

The greatest discovery of all time is that a person can change his future by merely changing his attitude.

Some are born great, some achieve greatness, and some have greatness thrust upon them.