Knowledge comes from spending time listening to other people. Love comes from spending time listening to God. That is why someone can spend four years in Bible School or Seminary and come out with knowledge but not love. Love comes from spending time listening to and obeying God. If we lack love, it’s because we are accumulating knowledge by listening to people, not spending time listening to God.
1 Corinthians 8:1-3 “Now concerning things sacrificed to idols, we know that we all have knowledge. Knowledge makes arrogant, but love edifies. If anyone supposes that he knows anything, he has not yet known as he ought to know; but if anyone loves God, he is known by Him.”