Our friends show us what we can do; our enemies teach us what we must do.
No prudent antagonist thinks light of his adversaries.
The assault of our enemies is not part of our life; it is only part of our experience; we throw it off and guard ourselves against it as against frost, storm, rain, hail, or any other of the external evils which may be expected to happen.
I have always paid attention to the merits of my enemies, and found it an advantage.
Commonplaceness, the surrender to the average, that good which is not bad but still the enemy of the best - That is our besetting danger.
I have heard myself accused of being an opponent, an enemy of mathematics, which no one can value more highly than I, for it accomplishes the very thing whose achievement has been denied me.
I don't know a greater advantage, than to appreciate the worth of an enemy.
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