When, for example, poetry, history, chemistry, or whatever other human science you like has struck chords of wonder in the imagination of a young man, unless he is careful to watch the effect this has on his mind, unless he thoroughly examines what is to be gained from these sciences, unless he compares the trouble he will have in learning them to the profit he will receive from them, in short, unless he is as inquisitive as he should be in order to form a proper judgment, there is a great danger that his wonder, which shows him these sciences only in their best light, will seduce him.