Puritan pastor Thomas Manton makes a point…
The ox bellows, the ass brayeth, goats and sheep may be known by their bleat; and so is a man by the tenor of his discourse. As the constitution of the mind is, so are the words. …. Still the tap runs according to the liquor with which the vessel is filled; and a man’s speech betrays him of what kind he is….
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” We are apt to abuse our knowledge. Saving [spiritual] knowledge makes us more humble; but carnal [sinful] knowledge more proud. … The more we know God or ourselves by a divine light, the more humble we shall be. … When Adam’s eyes were opened he ran into the bushes, he was ashamed; so when God opens the eyes, and teaches a Christian, this makes him more humble.”
“Man’s light may make us more learned, but God’s light more holy.”
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The Breadline 