1 John 4:13, 16

By this we know [with confident assurance] that we abide in Him and He in us, because He has given to us His [Holy] Spirit.

We have come to know [by personal observation and experience], and have believed [with deep, consistent faith] the love which God has for us. God is love, and the one who abides in love abides in God, and God abides continually in him.