Then they said to Him, “What shall we do, that we may work the works of God?” – John 6:28

Never hope to be saved except by God’s way of salvation. O that the Holy Ghost would enable you in your heart to say, “Now I come to Thee, O Jesus; guilty as I am, I lift my eyes to Thee, and this is my prayer: ‘Help me for Thy mercy’s sake; have pity upon me and cleanse me in Thy blood, for I put all my trust in Thee.'” Resolve, O seeker, to have no refuge of lies, no Savior but the Lamb of God.

I will confess to you, dear seeker, that often I am myself personally driven to do what I trust you may be led to do today. I look back upon my past life, and while I have much to thank God for, much in which to see His Spirit’s hand, yet when I feel my responsibilities and my shortcomings, my heart sinks within me. When I think of my transgressions, better known to myself than to anyone else, and remember too that they are not known even to me as they are to God, I feel all hope swept away and my soul left in utter despair, until I come anew to the cross, and bethink me of who it was that died there, and why He died, and what designs of infinite mercy are answered by His death. It is so sweet to look up to the Crucified One again, and say, “I have nought but Thee, my Lord, no confidence but Thee. If Thou be not accepted as my substitute I must perish; if God’s appointed Savior be not enough, I have no other, but I know Thou art the Father’s Well-beloved, and I am accepted in Thee. Thou art all I want, and all I have.”…The Jews asked our Savior, “What shall we do that we may work the works of God?” and He said, “This is the work of God, that ye believe on Him whom He hath sent.” The greatest of all works, the most Godlike work, is to leave off self-righteous seeking, and trust in Jesus. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0947.cfm