Was Paul in error then?
Rom 13:9 For: "Do not commit adultery; do not murder; do not steal; do not bear false witness; do not lust;" and if there is any other commandment, it is summed up in this word, "You shall love your neighbor as yourself."
Paul couldn't be any clearer, he sums up the visible signs of love for your neighbors as fullfillment of this part of the 10 commandments.
Christ himself equates love of God as keeping God's commandments.
Do you have a better definition of love father?
Yes, I do. Look at Jesus' crucified upon the cross and see how much He loves us.