Logical consequences are the scarecrows of fools and the beacons of wise men.

Trust a witness in all matters in which neither his self-interest, his passions, his prejudices, nor the love of the marvellous is strongly concerned. When they are involved, require corroborative evidence in exact proportion to the contravention of probability by the thing testified.

True science and true religion are twin sisters, and the separation of either from the other is sure to prove the death of both. Science prospers exactly in proportion as it is religious; and religion flourishes in exact proportion to the scientific depth and firmness of its basis.

No man is any the worse off because another acquires wealth by trade, or by the exercise of a profession; on the contrary, he cannot have acquired his wealth except by benefiting others to the extent of what they considered to be its value.

The only people, scientific or other, who never make mistakes are those who do nothing.

That which lies before the human race is a constant struggle to maintain and improve, in opposition to State of Nature, the State of Art of an organized polity; in which, and by which, man may develop a worthy civilization

Every great advance in natural knowledge has involved the absolute rejection of authority.