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

His last words, according to De Morgan: Man follows only phantoms.

Such is the advantage of a well constructed language that its simplified notation often becomes the source of profound theories.

[It] may be laid down as a general rule that, if the result of a long series of precise observations approximates a simple relation so closely that the remaining difference is undetectable by observation and may be attributed to the errors to which they are liable, then this relation is probably that of nature.

To Napoleon on why his works on celestial mechanics make no mention of God: Your Highness, I have no need of this hypothesis.

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

What we know is not much. What we don't know is enormous.