Iron sharpeneth iron - As hard iron, viz., steel, will bring a knife to a better edge when it is properly whetted against it: so one friend may be the means of exciting another to reflect, dive deeply into, and illustrate a subject, without which whetting or excitement, this had never taken place. Had Horace seen this proverb in the Septuagint translation when he wrote to the Pisos?
Ergo fungar vice cotis, acutum
Reddere quae ferrum valet, exors ipsa secandi.
Hor. Ars. Poet., ver. 304.
"But let me sharpen others, as the hone
Gives edge to razors, though itself have none."
Francis.
The proverb expresses the gain of mutual counsel as found in clear, well-defined thoughts. Two minds, thus acting on each other, become more acute. This is better than to see in “sharpening” the idea of provoking, and the point of the maxim in the fact that the quarrels of those who have been friends are bitter in proportion to their previous intimacy.