1) The greatest commandment is to love God and love others. Mother Teresa's life exemplified this through dedicating her life to serving the poor in India with great love.
2) Jesus said the two greatest commandments are to love God with all your heart, soul and mind, and to love your neighbor as yourself. We must first understand God's sacrificial love for us before we can love him and others.
3) God's love is proven through his words and actions, and nothing can separate us from his love. We should declare our love for God through prayer, worship and obedience, although our love will not be perfect as his is.