Feeling alone guides the mind.

We must alter theory to adapt it to nature, but not nature to adapt it to theory.‎

Experiment is fundamentally only induced observation.

We achieve more than we know. We know more than we understand. We understand more than we can explain.

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.

Proof that a given condition always precedes or accompanies a phenomenon does not warrant concluding with certainty that a given condition is the immediate cause of that phenomenon. It must still be established that when this condition is removed, the phenomen will no longer appear.

Tout est poison, rien n'est poison, tout est une question de dose. Everything is poisonous, nothing is poisonous, it is all a matter of dose.