When introduced at the wrong time or place, good logic may be the worst enemy of good teaching. Votes: 7

In order to solve this differential equation you look at it until a solution occurs to you. Votes: 6

An idea which can be used once is a trick. If it can be used more than once it becomes a method. Votes: 0

If there is a problem you can't solve, then there is an easier problem you can't solve: find it. Votes: 0

It is better to solve one problem five different ways, than to solve five problems one way. Votes: 0