When we love someone, there is no limit to what we do to please them. Jesus gives his disciples a very simple list–if they love him, keep his commandments. Simple, yet nearly impossible without help. Jesus promises we will have a Helper, the Holy Spirit.
John 14:15-21 (ESV)
Jesus Promises the Holy Spirit
 “If you love me, you will keep my commandments.  And I will ask the Father, and he will give you another Helper, to be with you forever,  even the Spirit of truth, whom the world cannot receive, because it neither sees him nor knows him. You know him, for he dwells with you and will be in you.
 “I will not leave you as orphans; I will come to you.  Yet a little while and the world will see me no more, but you will see me. Because I live, you also will live.  In that day you will know that I am in my Father, and you in me, and I in you.  Whoever has my commandments and keeps them, he it is who loves me. And he who loves me will be loved by my Father, and I will love him and manifest myself to him.”