For this command is a lamp

My son, keep your father’s command
    and do not forsake your mother’s teaching.
Bind them always on your heart;
    fasten them around your neck.
When you walk, they will guide you;
    when you sleep, they will watch over you;
    when you awake, they will speak to you.
For this command is a lamp,
    this teaching is a light,
and correction and instruction
    are the way to life,
Proverbs 6:20-23