Develop love for God and attain happiness

Love towards one's brother cultivates love towards God.  We are happy when we secretly love all people.  Then we will feel that everyone loves us.  No one can attain to God unless he first passes through his fellow men.  For the person who does not love his brother whom he has seen, how can he love God whom he has not seen?  (I John 4:20).  We need to love and sacrifice ourselves selflessly for everyone without seeking recompense.  A love that seeks something in return is selfish.  It is not genuine, pure and sincere.