'One's' in the Bible

John the Baptist appeared in the wilderness preaching a baptism of repentance for the forgiveness of sins [that is, requiring a change of one’s old way of thinking, turning away from sin and seeking God and His righteousness].

and to love Him with all the heart and with all the understanding and with all the strength, and to [unselfishly] love one’s neighbor as oneself, is much more than all burnt offerings and sacrifices.”