Because it is contained in Scripture, "Behold, I lay in Zion a chief cornerstone, chosen, and precious: He who believes in him will not be disappointed."
For you who believe therefore is the honor, but for those who are disobedient, "The stone which the builders rejected, has become the chief cornerstone,"
being built on the foundation of the apostles and prophets, Christ Jesus himself being the chief cornerstone;
The princes of Zoan have become fools. The princes of Memphis are deceived. They have caused Egypt to go astray, who are the cornerstone of her tribes.
Therefore thus says the Lord the LORD, "Behold, I lay in Zion for a foundation a stone, a tried stone, a precious cornerstone of a sure foundation. He who believes shall not act hastily.
Whereupon were its foundations fastened? Or who laid its cornerstone,
But he looked at them, and said, "Then what is this that is written, 'The stone which the builders rejected, the same was made the chief cornerstone?'
From him will come forth the cornerstone, from him the nail, from him the battle bow, from him every ruler together.
Let us love one another, for love comes from God and every one who loves is a child of God and knows God. He who loves not man does not know God, for God is love. God showed his love for us, for he sent his only Son into the world that through him we might have life. Love the stranger.
In Mark 12:30 Jesus said;
And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this [is] the first commandment.
And the second Mark 12:31 [is] like, [namely] this, Thou shalt love thy neighbour as thyself. There is none other commandment greater than these.