1 Corinthians 1:18-25: "...the message of the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God. For it is written:
       “I will destroy the wisdom of the wise,
       And bring to nothing the understanding of the prudent.”
Where is the wise? Where is the scribe? Where is the disputer of this age? Has not God made foolish the wisdom of this world?
     (21) For since, in the wisdom of God, the world through wisdom did not know God, it pleased God through the foolishness of the message preached to save those who believe. For Jews request a sign, and Greeks seek after wisdom; but we preach Christ crucified, to the Jews a stumbling block and to the Greeks foolishness, but to those who are called, both Jews and Greeks, Christ the power of God and the wisdom of God. 

This is my commandment, that you love one another as I have loved you.... You are my friends, if you do what I command you."  (John 15:12, 14)

"Jesus said to him, ‘You shall love the Lord your God with all your heart, with all your soul, and with all your mind.’ This is the first and great commandment. And the second is like it: ‘You shall love your neighbor as yourself."’ (Matthew 22:37-39)

You shall love the Lord your God with all your heart, with all your soul, and with all your strength. And these words which I command you today shall be in your heart." (Deut. 6:5-6)

“See, I have set before you today life and good, death and evil, in that I command you today to love the Lord your God, to walk in His ways, and to keep His commandments, His statutes, and His judgments, that you may live and multiply..." (Deut. 30:15-16)

"...take careful heed to do the commandment and the law which Moses the servant of the Lord commanded you, to love the Lord your God, to walk in all His ways, to keep His commandments, to hold fast to Him, and to serve Him with all your heart and with all your soul.” (Joshua 22:5)