“Knowledge must come through action; you can have no test which is not fanciful, save by trial.Sophocles
“If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts he shall end in certainties.Francis Bacon
“Age is no better, hardly so well, qualified for an instructor as youth, for it has not profited so much as it has lost.Henry David Thoreau