1. whereof - Adverb
2. whereof - Conjunction
Of which; of whom; formerly, also, with which; -- used relatively.
Of what; -- used interrogatively.
Source: Webster's dictionaryWhereof one cannot speak, thereof one must be silent. Ludwig Wittgenstein
It is thus quite simply false that whereof one cannot speak (in the sense of 'there is nothing to say about it that specifies it and grants it separating properties'), thereof one must be silent. It must on the contrary be named. Alain Badiou
Time whereof the memory of man runneth not to the contrary. William Blackstone
Words must be taken according to the matter whereof they are uttered. Richard Hooker
The only good histories are those that have been written by the persons themselves who commanded in the affairs whereof they write. Michel de Montaigne
Descartes is rightly regarded as the father of modern philosophy primarily and generally because he helped the faculty of reason to stand on its own feet by teaching men to use their brains in place whereof the Bible, on the one hand, and Aristotle, on the other, had previously served. Arthur Schopenhauer