For the commandment is a lamp; and the law is light; and reproofs of instruction are the way of life: For the commandment is a lamp - It illuminates our path. It shows us how we should walk and praise God.
And the law is light - A general light, showing the nature and will of God, and the interest and duty of Man.
And reproofs of instruction - Or, that instruction which reproves us for our sins and errors leads us into the way of life.