I. The actions of children become, in process of time, their own doings. Children move before they act, and they live as mere animals before they act spiritually and morally. But in process of time the child acts. All its movements become conduct, the result of a determination to behave itself in a particular way. This is what is meant by "his doings."
II. When the actions of children become their doings, the children are recognised as accountable. (1) God recognises the child as the author of its own actions; He sees the doings of the child spring from a motive and principle within. (2) The god of evil knows, by the doings of children, with whom and with what he has to do. (3) The angelic inhabitants of heaven recognise children in their ministrations. (4) Children are recognised as accountable by their fellow human beings.
III. From these facts we draw the following inferences: (1) If a child be known by his doings, the evils of sin are not escaped by the childhood of the sinner. (2) If a child be known by his doings, he is, as a child, exerting influence for good or for evil. (3) If a child be known by his doings, all the differences of human character are not traceable to education. (4) If a child be known by his doings, the character of the future man is often indicated by the character of the present child. (5) If a child be known by his doings, God does not treat a generation of children en masse,but individually. (6) If a child be known by his doings, one test of character is universally applied by the Judge of all.
S. Martin, Rain Upon the Mown Grass,p. 460.
Reference: Proverbs 20:11. New Manual of Sunday School Addresses, p. 115.