‘Which forsaketh the guide of her youth’, in other words, the adulteress has abandoned her first husband. She stands for someone married young to a good man, but she has destroyed the relationship.
God intends we should be in a binding relationship to him, and to our spouse. This world will try to corrupt by intellectual means and by emotional means. The wisdom God gives at conversion will protect us and keep us. Here is God, here is a human being with a living soul, and yet the world is full of people who say there is no God, there is no soul, there are no absolute standards of right and wrong. Come enjoy yourself; do as you like. Let us teach you all kinds of techniques for sin, and for sensuality, the great objective is to indulge and enjoy, and so on. It is lawlessness.
And sin always says this, the world says this. The devil whispers this in my ear, ‘Come, you will be appreciated, you will be accepted, you are wanted in this world's system. Forget about that God of yours. That God of yours has a lot of ties, and restrictions, and obligations and duties’, and so sin appeals to the lawlessness within us. Be free, be unfettered, be unrestricted, so this is an analysis of the method of temptation, and the nature of sin, and worldliness. It is not primarily about the adulteress, though obviously it would include that, but it is what that can picture, and how that can teach of sin, and its ways,