Science is bound, by the everlasting vow of honour, to face fearlessly every problem which can be fairly presented to 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.

Mathematics is the only true metaphysics.

All of science can be divided into physics and stamp-collecting.

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

[Of the ether] it is no greater mystery at all events than the shoemakers' wax.

If you can not measure it, you can not improve it.