The true sign of intelligence is not knowledge but imagination.

The only source of knowledge is experience.

Experience is the name everyone gives to their mistakes.
Oscar Wilde, Lady Windermere’s Fan, 1892, Act III

A perpetual holiday is a good working definition of hell.

A ploughman on his legs is higher than a gentleman on his knees.

Diligence is the mother of good luck, and God gives all things to industry.

By working faithfully eight hours a day, you may get to be a boss and work twelve hours a day.

Handle your tools without mittens.

Plough deep while sluggards sleep.

We build too many walls and not enough bridges.

No great discovery was ever made without a bold guess.

Tact is the art of making a point without making an enemy.

This most beautiful system [The Universe] could only proceed from the dominion of an intelligent and powerful Being.

To myself I am only a child playing on the beach, while vast oceans of truth lie undiscovered before me.

No great discovery was ever made without a bold guess.

Tact is the art of making a point without making an enemy.

If I have seen further than others, it is by standing upon the shoulders of giants.

Let your dreams outgrow the shoes of your expectations.

I never did a day’s work in my life. It was all fun.

I never failed once. It just happened to be a 2000-step process.

The three great essentials to achieve anything worth while are, first, hard work; second, stick-to-itiveness; third, common sense.

Good fortune is what happens when opportunity meets with planning.

I haven’t failed, I’ve found 10,000 ways that don’t work.

Genius is one percent inspiration and ninety-nine percent perspiration.

Opportunity is missed by most people because it is dressed in overalls and looks like work.