From John Locke, Thoughts on Education, 1693:

I have one more thing to add, which as soon as I mention, I shall run the danger of being suspected to have forgot what I am about, and what I have above written concerning education, all tending toward a gentleman's calling, with which a trade seems wholly inconsistent. And yet, I cannot forbear to say, I would have him learn a trade, a manual trade; nay, two or three, but one more particularly.

The busy inclination of children being always to be directed to something that may be useful to them... thus skill not only in languages, and learned sciences, but in painting, turning, gardening, tempering, and working in iron, and all other useful arts, is worth the having.