Why does the Holy Bible use human expressions to speak about God?

God reveals Himself to us who are human using the human language that we can understand, so that we may enter into loving relationships with Him, and for the sake of our growth. So, when it is said of Him that He regretted the evil that He had threatened, this does not mean that there is evil in Him, nor any change in His intentions. He wants us to be a living icon of Himself. Divine wrath contains no human emotions — it is an expression of the divine grace that urges us to take action that will lead us to enjoy His love and care, to be liberated from the fear of divine justice, and to contemplate unchanging divine mercy.

If we seek His grace, we shall find it, and then we can actively come to know His eternal nature; namely love, mercy, and compassion, together with divine justice. This is what the incarnate Word of God has revealed to us. We know that love is God’s nature from eternity, within the co-essential Holy Trinity. And by the work of the Holy Spirit within us, we experience this divine love in practice, in our lives on earth. Our knowledge, though it is in part, is growing in us, for we consider ourselves to be children in the bosom of God, favored by His love, which is inexpressible, indescribable and immeasurable. The apostle Paul captures this in his first epistle to the Corinthians (13:9–12).