The truth of things is the chief nutriment of superior intellects.
Even the richest soil, if left uncultivated will produce the rankest weeds.
Instrumental or mechanical science is the noblest and above all others, the most useful.
A bird is an instrument working according to mathematical law, which instrument it is within the capacity of man to reproduce with all its movements.
One can have no more mastery over the environment, than one has over himself.
All our knowledge originates in opinion.