I am convinced that the unwritten knowledge scattered among men of different callings surpasses in quantity and in importance anything we find in books, and that the greater part of our wealth has yet to be recorded.

I also take it as granted that every created thing, and consequently the created monad also, is subject to change, and indeed that this change is continual in each one.

[Alternate translation:] The Divine Spirit found a sublime outlet in that wonder of analysis, that portent of the ideal world, that amphibian between being and not-being, which we call the imaginary root of negative unity.

The present is saturated with the past and pregnant with the future.

It is worth noting that the notation facilitates discovery. This, in a most wonderful way, reduces the mind's labour.

There is nothing without reason.

A great doctor kills more people than a great general.