'Love of God' in the Bible

but whoso keepeth his word, in him verily hath the love of God been perfected. Hereby we know that we are in him:

But whoso hath the world's goods, and beholdeth his brother in need, and shutteth up his compassion from him, how doth the love of God abide in him?

Herein was the love of God manifested in us, that God hath sent his only begotten Son into the world that we might live through him.

For this is the love of God, that we keep his commandments: and his commandments are not grievous.