Bind them continually upon thine heart, and tie them about thy neck.
– Proverbs 6:21
This verse speaks of the way the son is to keep and not forsake the wise instruction of his parents. Binding upon the heart refers to holding them in the mind and meditating on them. It could even refer to memorization by rote. The point is for the son to take them as a permanent fixture of his mind and thinking. They should always be close at hand. A necklace, jewel, or some other ornament is often tied about the neck. On the one hand, this instructs the son to highly esteem wisdom. On the other, it reminds him to have it always with him.