The joy of discovery is certainly the liveliest that the mind of man can ever feel.

The true worth of an experimenter consists in his pursuing not only what he seeks in his experiment, but also what he did not seek.

Science increases our power in proportion as it lowers our pride.

Even mistaken hypotheses and theories are of use in leading to discoveries. This remark is true in all the sciences. The alchemists founded chemistry by pursuing chimerical problems and theories which are false. In physical science, which is more advanced than biology, we might still cite men of science who make great discoveries by relying on false theories.

When entering on new ground we must not be afraid to express even risky ideas so as to stimulate research in all directions. As Priestley put it, we must not remain inactive through false modesty based on fear of being mistaken.

In the philosophic sense, observation shows and experiment teaches.

The joy of discovery is certainly the liveliest that the mind of man can ever feel.