"And we know and rely on the love God has for us. God is love. Whoever lives in love lives in God, and God in him." 1 John 4:16

Love is mentioned three times in this passage and it is the Greek word Agape. (Agape is the noun and Agapao is the verb). I will share some defining comments of these two words from:
"Vine's Expository Dictionary of Old and New Testament Words" they are
used:
"1. To describe the attitude of God toward:
His Son,
"And I have declared to them Your name, and will declare it, that the love with which You loved Me may be in them, and I in them." John 17:26

The human race generally,
"For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life.
John 3:16
And,
"But God demonstrates His own love toward us, in that while we were still sinners, Christ died for us." Romans 5:8

To such as believe on the Lord Jesus Christ particularly, "He who has My commandments and keeps them, it is he who loves Me. And he who loves Me will be loved by My Father, and I will love him and manifest Myself to him." John 14:21

2. To convey His will to His children concerning their attitude:
One toward another,
"A new commandment I give to you, that you love one another; as I have loved you, that you also love one another." John13:34

Toward all men,
"May the Lord make your love increase and overflow to each other and for everyone else, just as ours does for you." 1 Thessalonians 3:12

3. To express the essential nature of God, "He who does not love does not know God, for God is love." 1 John 4:8"

Vine's goes on to say,
"In respect of agapao as used of God, it expresses the deep and constant love and interest of a perfect Being toward entirely unworthy objects, producing and fostering a reverential love in them toward the giver, and a practical love towards those who are partakers of the same, and a desire to help others to seek the Giver."

Love has its perfect expression among men in our Lord Jesus Christ, "Therefore be followers of God as dear children. And walk in love, as Christ also has loved us and given Himself for us..." Ephesians 5:1-2

Christian love expresses itself in obedience to God's commandments, "If you love Me you will keep my commandments." John 14:15 And, "Jesus answered and said to him, 'If anyone loves Me, he will keep My word, and My Father will love him, and We will come to him and make Our home with him." John 14:23

For the Christian, love is to have pre-eminence as seen in Mark 12:30-31 in Jesus' answer to one of the scribes, "'And you shall love the Lord your God with all your heart, with all your soul, with all your mind, and with all your strength.' This is the first commandment. And the second, like it, is this: 'You shall love your neighbor as yourself.' There is no other commandment greater than these."

Agape is a choice not a feeling and it seeks the welfare of all and does no harm to anyone, "Love does no harm to its neighbor. Therefore love is the fulfillment of the law." Romans 13:10

Our opening Scripture says 'we know and rely on the love God has for us'. Do we KNOW? Have we come to REST in Christ Jesus knowing that God is in control of all things and we are safe in His hands? Are we anxious or fearful? 1 John 4:18 tells us, "There is no fear in love [dread does not exist], but full-grown (complete,
perfect) love turns fear out of doors and expels every trace of terror! For fear brings with it the thought of punishment, and [so] he who is afraid has not reached the full maturity of love [is not yet grown into love's complete perfection]." The Amplified Bible

I close with 1 John 4:7-8
Beloved, let us love one another, for love is of God; and everyone who loves is born of God and knows God. He who does not love does not know God, for God is love."

Thank You Father for Your great love in which You love such as we! How awesomely gracious You are! All glory is Yours!  Amen