The tree is known by its fruits, a man by his doings, even a young tree by its first fruits, a child by his childish things, whether his work be clean only, appearing good (the word is used Pro 16:2), or whether it be right, that is, really good. This intimates, 1. That children will discover themselves. One may soon see what their temper is, and which way their inclination leads them, according as their constitution is. Children have not learned the art of dissembling and concealing their bent as grown people have. 2. That parents should observe their children, that they may discover their disposition and genius, and both manage and dispose of them accordingly, drive the nail that will go and draw out that which goes amiss. Wisdom is herein profitable to direct.

Even a child is known by his doings,.... As well as a man; "ye shall know them by their fruits", Mat 7:16; professors and profane. So a child soon discovers its genius by its actions; it soon shows its inclination and disposition; and some shrewd guesses may be made how it will turn out, a wise man or a fool, a virtuous or a vicious man; though this does not always hold good, yet something may be observed, which may be a direction to parents in the education of their children, and placing them out to what is proper and suitable for them. Some observe, that the word has a quite contrary meaning, that "a child carries himself a stranger by his doings" (e); so that he is not known by them: he so conceals and disguises himself, he acts so fraudulently and deceitfully, and plays the hypocrite, and puts the cheat on men, that they cannot tell what he is, nor what he will be; and if children can thus dissemble, as not to be known by their actions, then much more grown persons;

whether his work be pure, and whether it be right; not what his present work is, or actions are, but what his later life and conversation will be; which in some measure may be judged of, though not with certainty and exactness; see Pro 22:6; especially when he acts a covert and deceitful part.

(e) "ignotus erit", i.e. "non facile cognoscitur", Vatablus; so R. Joseph Kimchi; "simulat se alium esse", Gussetius, p. 413. "dissimulatorem agit", Schultens.

The conduct of children even is the best test of principle (compare Mat 7:16).