He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals.

If you only read the books that everyone else is reading, you can only think what everyone else is thinking.

Jealousy is the tribute mediocrity pays to genius.

Tomorrow hopes we have learned something from yesterday.

To avoid criticism say nothing, do nothing, be nothing.

Empty pockets never held anyone back. Only empty heads and empty hearts can do that.

Great dreams of great dreamers are always transcended.

Act enthusiastic and you will be enthusiastic

The noblest pleasure is the joy of understanding.

Do not pray for an easy life, pray for the strength to endure a difficult one.

One new feature or fresh take can change everything.

Science is organized knowledge. Wisdom is organized life.

Never put off for tomorrow, what you can do today.

Do your little bit of good where you are; it's those little bits of good put together that overwhelm the world.

What lies behind us and what lies ahead of us are tiny matters compared to what lives within us.

An understanding of the natural world is a source of not only great curiosity, but great fulfilment.

Nothing is so strong as gentleness, nothing so gentle as real strength

Doubt is the origin of wisdom

Do not reveal what you have thought upon doing, but by wise council keep it secret being determined to carry it into execution.

We never see ourselves as others see us.

How often it is that the angry man rages denial of what his inner self is telling him.