Iron sharpens iron; scholar, the scholar. Votes: 1
As iron sharpens iron, so a friend sharpens a friend. Votes: 1
One must dig deeply into opposing points of view in order to know whether your own position remains defensible. Iron sharpens iron. Votes: 1
It's iron that can sharpen iron; wood cannot do that. Votes: 0
Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigor of the mind. Votes: 6 Leonardo da Vinci
Want to accomplish something, any-damn-thing? Sharpen your political skills! Votes: 3 Tom Peters