A man of spirit must not think of the word difficulty as so much as existing. Away with it!
Some people feel with their heads and think with their hearts.
Probably no invention came more easily to man than heaven.
Doubt must be no more than vigilance, otherwise it can become dangerous.
He swallowed a lot of wisdom, but all of it seems to have gone down the wrong way.
Some people come by the name of genius in the same way that certain insects come by the name of centipede -- not because they have a hundred feet, but because most people can't count above 14.