Christianity

For God so loved the world that He gave his one and only son so that whoever believes in him shall not perish but have eternal life. John 3 : 16

This is the greatest act of love ever shown. To reciprocate such love we must obey God's commandments, because the Bible says, this is what the love of God means that we observe his commandments and yet his commandments are not burdensome. 1 John 5 : 3