Physics, beware of metaphysics.
All my discoveries have been made in answer to prayer.
The instinct of brutes and insects can be the effect of nothing else than the wisdom and skill of a powerful ever-living agent.
If I am anything, which I highly doubt, I have made myself so by hard work.
Therefore, the causes assigned to natural effects of the same kind must be, so far as possible, the same.
The description of right lines and circles, upon which geometry is founded, belongs to mechanics. Geometry does not teach us to draw these lines, but requires them to be drawn.