By H.H. Pope Shenouda III 
God's love is not mere vague emotions, but it ought to be fruitful. It appears in keeping His commandments.
St. John the Beloved says clearly, "By this we know  that we know Him, if we keep His commandments. He who says, 'I know  Him,' and does not keep His commandments, is a liar, and the truth  is not in him. But whoever keeps His word, truly the love of God is  perfected in him, "For this is the love of God, that we keep His  commandments." (1 Jn 2: 3- 5; 5: 3) On the contrary he who breaks God's  commandments does not love Him, but is disobedient. He is treacherous  and can even be counted among His adversaries. Therefore keeping the  commandments is a main sign for those who love God. Does a child who  loves his natural father not obey his commandments?