73 Quotes by Lord Kelvin

If we can't express what we know in the form of numbers, we really don't know much about it.

Suppose that you could mark the molecules in a glass of water; then pour the contents of the glass into the ocean and stir the latter throughly so as to distribute the marked molecules uniformly throughout the seven seas; if then you took a glass of water anywhere out of the ocean, you would find in it about a hundred of your marked molecules.

When you are face to face with a difficulty, you are up against a discovery.

When you can measure what you are speaking about, and express it in numbers, you know something about it.

Christianity without the cross is nothing. The cross was the fitting close of a life of rejection, scorn and defeat. But in no true sense have these things ceased or changed. Jesus is still He whom man despiseth, and the rejected of men. The world has never admired Jesus, for moral courage is yet needed in every one of its high places by him who would "confess" Christ. The "offense" of the cross, therefore, has led men in all ages to endeavor to be rid of it, and to deny that it is the power of God in the world.

Can you measure it? Can you express it in figures? Can you make a model of it? If not, your theory is apt to be based more upon imagination than upon knowledge.

There is nothing new to be discovered in physics now. All that remains is more and more precise measurement.

To measure is to know.

If you study science deep enough and long enough, it will force you to believe in God.