Sacrifice is the greatest proof of God’s love for us. He showed us this example by giving His only Son to die for our sins (John 3:16). On the other hand, we must prove that we love him. Scripture says that we love Him because He first loved us. This love can not be by mouth but by deeds.
Therefore, our most important proof that we love Him (Christ) is our obedience to His instructions. It is not in what we give in church or towards missions, but in our day-to-day obedience to His voice.