Philosophy is such an impertinently litigious lady that a man had as good be engaged in lawsuits as have to do with her.

I do not know what I may appear to the world, but to myself I seem to have been only a child playing on the seashore while the great ocean of truth lay all undiscovered before me.

In the absence of any other proof, the thumb alone would convince me of God's existence.

If I have seen further it is by standing on the shoulders of giants.

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

Every body perseveres in its state of rest or of uniform motion in a straight line, except in so far as it is compelled to change that state by impressed forces.

To every action there is always opposed an equal action.

O Diamond! Diamond! thou little knowest the mischief done!