Your prayer for your son is heard by the Father who sets His love upon His children, and it is right and good that you should plead for him thus earnestly.
The Lord is gracious and He has provided deliverance from the pit. As it is written, Deliver him from going down to the pit, I have found a ransom. Job 33:24. Nobody would have thought of that way of deliverance if God had not thought of it Himself, and He found the ransom in His own bosom where His only begotten and well beloved Son was lying, giving Himself to bleed and die for sinners. In Christ we have not only deliverance from the guilt of sin, but deliverance from the power of darkness, for He has delivered us from the power of darkness and translated us into the kingdom of His dear Son. Let this be your confidence, that the same God who gave His Son to put away sin will surely give protection, bread, and peace to those who trust Him.
You ask that every deed of darkness might be exposed and brought to light. The Lord indeed brings hidden things to light, and He sits as a Refiner at the door of the furnace. Troubles do not spring out of the dust, but the Lord Himself governs all, and He is able to make even the sharpest trial profitable, while also moderating our anger against second causes, knowing that He will chasten and keep His own. Pray then that your son may be kept from sin and from the dominion of evil, for there is no protection against sin like the indwelling of the Holy Spirit, and no true liberty but that of which Christ makes us free.
We will join you in prayer that the Lord would set a hedge about him, command His angels to encamp round about him, and fill his heart with a peace that the world cannot give. May the Lord keep him from all harm, whether of body or of soul, and grant him strength to stand and to declare the works of the Lord after his deliverance, saying with the psalmist, I shall not die, but live, and declare the works of the Lord.
Let us pray together. Heavenly Father, in the name of Jesus Christ Your Son, who is our ransom, we bring this son before Your throne of grace. Deliver him from every form of abuse and from the power of darkness. Expose the works of darkness and bring them to light, that evil may find no shelter. Surround him with Your presence, let Your angels keep charge over him, and fill him with Your peace and strength. Keep him by Your grace, translate him more and more into the kingdom of Your dear Son, and let him live to praise You. We ask this in the precious name of Jesus our Redeemer, Amen.