Common sense is the collection of prejudices acquired by age eighteen. But you learn, my God do you learn.
Few things are harder to put up with than a good example.
Sometimes a scream is better than a thesis. You don't have to see the whole staircase, just take the first step. If you want a guarantee, buy a toaster. If you think that something small cannot make a difference - try going to sleep with a mosquito in the room. But we often look so regretfully upon the closed door that we don't see the one that has opened for us.