The Children's Book of Virtues

The fisher who draws in his net too soon, Won't have any fish to sell;

The child who shuts up his book too soon, Won't learn any lessons well.

If you would have your learning stay, Be patient--don't learn too fast;

The man who travels a mile each day, May get round the world at last.

(p. 10)

アメリカの子供向けの結構売れている本らしいですけど良いこと書いてありますね。道徳を教える本のようです。