Yet the greatest reason that God loves us, because we are in Christ, is that He loves as much as He loves His Son:
"23I in them, and thou in me, that they may be made perfect in one; and that the world may know that thou hast sent me, and hast loved them, as thou hast loved me." (John 17: 23)
And how long has God the Father loves His Son?:
"24Father, I will that they also, whom thou hast given me, be with me where I am; that they may behold my glory, which thou hast given me: for thou lovedst me before the foundation of the world" (John 17: 24)
It's important that we know our Father.
Yet how best to know the Father? By knowing the Son:
"8Philip saith unto him, Lord, shew us the Father, and it sufficeth us. 9Jesus saith unto him, Have I been so long time with you, and yet hast thou not known me, Philip? he that hath seen me hath seen the Father; and how sayest thou then, Shew us the Father? 10Believest thou not that I am in the Father, and the Father in me? the words that I speak unto you I speak not of myself: but the Father that dwelleth in me, he doeth the works." (John 14: 8-10)
"Who [God the Father] hath delivered us from the power of darkness, and hath translated us into the kingdom of his dear Son: 14In whom we have redemption through his blood, even the forgiveness of sins: 15Who is the image of the invisible God, the firstborn of every creature:" (Colossians 1: 13-15)
"2Grace and peace be multiplied unto you through the knowledge of God, and of Jesus our Lord," (2 Peter 1: 2)
Know who you Father is, and you know how much He loves you when you know Jesus: who He is, what He has done, and how much He loves you.