Absence sharpens love, presence strengthens it.
Math is like going to the gym for your brain. It sharpens your mind.
He that struggles with us strengthens our nerves, and sharpens our skill. Our antagonist is our helper.
One must dig deeply into opposing points of view in order to know whether your own position remains defensible. Iron sharpens iron.
The flame of anger, bright and brief, sharpens the barb of love.
As iron sharpens iron, so a friend sharpens a friend.
Solitude sharpens awareness of small pleasures otherwise lost.
Meditation is all about the pursuit of nothingness. It's like the ultimate rest. It's better than the best sleep you've ever had. It's a quieting of the mind. It sharpens everything, especially your appreciation of your surroundings. It keeps life fresh.
The journalistic vision sharpens to the point of maximum impact every event, every individual and social configuration; but the honing is uniform.
As the class struggle sharpens in the U.S. Marxism will come into its own as a great popular study.