TSK · Proverbs 6:21

It will be a sign for you on your hand and a memorial on your forehead, so that the law of the LORD may be in your mouth, for with a mighty hand the LORD brought you out of Egypt.

You should tie them as a reminder on your forearm and fasten them as symbols on your forehead.

Do not forsake wisdom, and she will protect you; love her, and she will guard you.

Bind them on your forearm; write them on the tablet of your heart.