1 John chapter 3, vs 2

… we … are … children of God … what we will e has not yet been made known … however … we do know … that … when Jesus Christ appears … we will be like Him … for … we will see Him as He is …

1 John chapter 5, vs 19

… we know … that … we are children of God … and … the world is under the control of evil …

1 John chapter 3, vs 10

… this … is … how … we know … who the children of God are … and … who the children of evil are … anyone … who does not do what is right is not God’s child … nor … is anyone who does not love their brother and sister …

1 John chapter 5, vs 2

… this … is … how … we know … that … we love … the children of God … by … loving God … and … carrying out His commands …

Matthew chapter 22, 36 - 40 Jesus Christ speaking

Teacher, which is the greatest commandment in the Teaching … Jesus replied … love the Lord your God with all your heart and with all your soul and with all your mind … this is the first and greatest commandment … and … the second is like it … love your neighbor as yourself … all the Law and the Prophets hang on these two commandments …