Teachers complain that the energy of this age makes their pupils unruly; I see that it is so, but are not they themselves to blame? When once they have let this energy flow through the channel of the senses, do they not know that they cannot change its course? Will the long and dreary sermons of the pedant efface from the mind of his scholar the thoughts of pleasure when once they have found an entrance; will they banish from his heart the desires by which it is tormented; will they chill the heat of a passion whose meaning the scholar realises? Will not the pupil be roused to anger by the obstacles opposed to the only kind of happiness of which he has any notion? And in the harsh law imposed upon him before he can understand it, what will he see but the caprice and hatred of a man who is trying to torment him? Is it strange that he rebels and hates you too? I know very well that if one is easy-going one may be tolerated, and one may keep up a show of authority. But I fail to see the use of an authority over the pupil which is only maintained by fomenting the vices it ought to repress; it is like attempting to soothe a fiery steed by making it leap over a precipice. Far from being a hindrance to education, this enthusiasm of adolescence is its crown and coping-stone; this it is that gives you a hold on the youth's heart when he is no longer weaker than you. His first affections are the reins by which you control his movements; he was free, and now I behold him in your power. So long as he loved nothing, he was independent of everything but himself and his own necessities; as soon as he loves, he is dependent on his affections. Thus the first ties which unite him to his species are already formed. When you direct his increasing sensibility in this direction, do not expect that it will at once include all men, and that the word "mankind" will have any meaning for him. Not so; this sensibility will at first confine itself to those like himself, and these will not be strangers to him, but those he knows, those whom habit has made dear to him or necessary to him, those who are evidently thinking and feeling as he does, those whom he perceives to be exposed to the pains he has endured, those who enjoy the pleasures he has enjoyed; in a word, those who are so like himself that he is the more disposed to self-love. It is only after long training, after much consideration as to his own feelings and the feelings he observes in others, that he will be able to generalise his individual notions under the abstract idea of humanity, and add to his individual affections those which may identify him with the race.