Who says the little knowledge is the dangerous thing?

St. John Chrysostom:

"A little learning is a dangerous thing, because it makes those who have it unwilling to learn more. The unlearned are more open to conviction, because they are not so foolish as to think that they are wise.

From "Homilies on the Epistles of Paul to the Crinthians," 5.2, published in P. Schaff et al., eds. A Select Library of the Nicene and Post-Nicene Fathers of the Christian Church. New York: Christian Literature, 1887-1894. Reprint, Grand Rapids, Mich." Eerdmans, 1952-1956. Reprint, Peabody, Mass.: Hendrickson, 1994. Citation has "1 12:23" which I presume means the first series (two were printed, each containing 14 volumes), vol. 12, page (or section?) 23 - as quoted in: T. Oden and G. Bray, eds., Ancient Christian Commentary on Scripture, New Testament Vol. VII, 1-2 Cointhians. Downers Grove, Ill.: InterVarsity Press, 1999, p. 17 (in reference to I Cor. 1:26).

Alexander Pope and others used it later (see other entries on this website).