The total number of Dirichlet's publications is not large: jewels are not weighed on a grocery scale.

You have no idea, how much poetry there is in the calculation of a table of logarithms!

I protest against the use of infinite magnitude ..., which is never permissible in mathematics.

I have had my results for a long time: but I do not yet know how I am to arrive at them.

To praise it would amount to praising myself. For the entire content of the work... coincides almost exactly with my own meditations which have occupied my mind for the past thirty or thirty-five years.

For three days now this angel, almost too heavenly for earth has been my fiancée ... Life stands before me like an eternal spring with new and brilliant colours. Upon his engagement to Johanne Osthof of Brunswick; they married 9 Oct 1805.

Theory attracts practice as the magnet attracts iron.