I never desire to converse with a man who has written more than he has read.

Samuel Johnson (1709-1784) English writer, lexicographer, critic

In George Birkbeck Hill (ed.), Johnsonian Miscellanies, Vol. 2, “Apophthegms, Sentiments, Opinions, & Occasional Reflections” (1897)
    (Source)

When asked by someone whether they should introduce the author Hugh Kelly to him.

Taken from John Hawkins (ed.), Works of Samuel Johnson, Vol. 11 (1787-1789), and the sources cited there.