[15] Those men, therefore, act worthily who, in every case and everywhere, have resolved to dedicate the whole of their youth as the first fruits of their earliest vigour to nothing in preference to education, in which it is well for a man to spend both his youth and his age; for as they say that vessels even when empty do nevertheless retain the odour of whatever was originally poured into them, [1] so also are the souls of the young deeply impressed with the indelible character of those conceptions which were the first to be offered to their minds, which cannot be at all washed away by the torrent of any ideas which flow over the mind afterwards, but they to the last show the character originally given to them. [cap.3] However, we have said enough of these matters.