I seem to have been like a child playing on the sea shore, finding now and then a prettier shell than ordinary, whilst the great ocean of truth lay undiscovered before me.

If I have ever made any valuable discoveries, it has been owing more to patient attention, than to any other talent.

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

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

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

The alteration of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.

To every action there is always opposed an equal reaction: or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.