Commentaries:
A sign must be something that can be seen, yet it authenticates what cannot necessarily be seen. For example, one may see a sign on the road that reads, "Columbia, South Carolina—77 miles." A person believes the sign, which tells him that Columbia is 77 miles down the road. The sign points to a fact that cannot be seen. Likewise, a person cannot see the law of God written in one's heart, but when such a person obeys God's law, his obedience points to where the laws are, written in the heart, unseen.
John W. Ritenbaugh
The Covenants, Grace and Law (Part 7)
This brief description covers virtually every part of every day. God is saying that no matter what we do, no matter what we say, no matter what comes into our life, every day we should be reflecting the mind of God in our life, in our speech, and in our attitude. In addition to that, we must reinforce our example by teaching the children verbally. God is saying that everywhere that child looks he should see examples of the way of God, not only in the way we work, but in the work itself.
John W. Ritenbaugh
Sanctification and the Teens
Other commentary entries containing this verse:
Exodus 20:12