…and let him return unto the LORD, and He will have mercy upon him; and to our God, for He will abundantly pardon. – Isaiah 55:7

He who would find mercy must return to God to obtain it. Do you ask how you are to do so? Well, first, you must begin to think about God. I really believe that some of you do not think half as much about God as you do about the Sultan of Turkey; and with some of you, almost anybody is a greater factor in your life than God is. With some of you, it would not make any difference if there were no God at all, except that you would be rather glad if that could be proved to be the case, for you would feel easier in your mind, and could, in such a case, go on in your sin without any of the compunction that you now feel. Yet, is it not a singular state of mind for a man, who knows that he is a creature made by God, but who really cares so little about Him that, if he could be assured that there were no such being, he would be better pleased than he is now? Oh, what a wretched state your heart must be in if it feels like that! It will have to be greatly altered if you are ever to be saved.

So, first, you must begin to think of God; and then, thinking of Him, you must yield to Him, give up your will to His will; and, doing that, you must pray to Him, cry to Him for mercy; and then you must trust Him. Especially, you must accept His way of salvation by faith in Jesus Christ; and when you do that, then you will be sure to love Him. When you get as far as that, you will be a new creature altogether. Then, God will delight in you; then, it will be misery to you to be out of His presence, and it will be the highest joy of your life to have constant communion with Him. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2797.cfm