They have never affirm'd any thing, concerning the cause, till the trial was past: whereas, to do it before, is a most venomous thing in the making of Sciences: for whoever has fix'd on his Cause, before he has experimented; can hardly avoid fitting his Experiment, and his Observations, to his Own Cause, which he had before imagin'd; rather than the Cause to the Truth of the Experiment itself. Referring to experiments of the Aristotelian mode, whereby a preconceived truth would be illustrated merely to convince people of the validity of the original thought.

Forever all goodness will be most charming; forever all wickedness will be most odious.

It is always esteemed the greatest mischief a man can do to those whom he loves, to raise men's expectations of them too high by undue and impertinent commendations.

Passion is the great mover and spring of the soul. When men’s passions are strongest, they may have great and noble effects; but they are then also apt to fall into the greatest miscarriages.

In all works of liberality something more is to be considered besides the occasion of the givers; and that is the occasion of the receivers.

What you dislike in another take care to correct in yourself.

Invention is an Heroic thing, and plac'd above the reach of a low, and vulgar Genius. It requires an active, a bold, a nimble, a restless mind: a thousand difficulties must be contemn'd with which a mean heart would be broken: many attempts must be made to no purpose: much Treasure must sometimes be scatter'd without any return: much violence, and vigour of thoughts must attend it: some irregularities, and excesses must be granted it, that would hardly be pardon'd by the severe Rules of Prudence.