We love Him, because He first loved us. – 1 John 4:19

If any man love not God, he is not a renewed man. Love to God is a mark which is always set upon Christ’s sheep, and never set upon any others. In enlarging upon this most important truth, I would call your attention to the connection of the text. You will find in the seventh verse of this chapter, that love to God is set down as being a necessary mark of the new birth. “Every one that loveth is born of God, and knoweth God.” I have no right, therefore, to believe that I am a regenerated person unless my heart truly and sincereIy loves God. It is vain for me, if I love not God, to quote the register which records an ecclesiastical ceremony, and say that this regenerated me; it certainly did no such thing, or the sure result would have followed. If I have been regenerated, I may not be perfect, but this one thing I can say, “Lord Thou knowest all things, Thou knowest that I love Thee.” When by believing we receive the privilege to become the sons of God, we receive also the nature of sons, and with filial love we cry, “Abba, Father.” There is no exception to this rule; if a man loves not God, neither is he born of God. Show me a fire without heat, then show me regeneration that does not produce love to God; for as the sun must give forth its light, so must a soul that has been created anew by divine grace display its nature by sincere affection towards God.” “Ye must be born again,” but ye are not born again unless ye love God. How indispensable, then, is love to God. When we believe, know, and feel that God loves us, we, as a natural result, love Him in return; and in proportion as our knowledge increases, our faith strengthens, our conviction deepens that we are really beloved of God; we, from the very constitution of our being, are constrained to yield our hearts to God in return. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1008.cfm