The simplicity of nature is not to be measured by that of our conceptions. Infinitely varied in its effects, nature is simple only in its causes, and its economy consists in producing a great number of phenomena, often very complicated, by means of a small number of general laws.

Je n'avais pas besoin de cette hypothèse-là.

What we know here is very little, but what we are ignorant of is immense.

Man follows only phantoms.

[Science] dissipates errors born of ignorance about our true relations with nature, errors the more damaging in that the social order should rest only on those relations. TRUTH! JUSTICE! Those are the immutable laws. Let us banish the dangerous maxim that it is sometimes useful to depart from them and to deceive or enslave mankind to assure its happiness.

What we know is not much. What we do not know is immense.

The weight of evidence for an extraordinary claim must be proportioned to its strangeness.