Here is one value of sin — redemption from it stimulates our heart to love Christ more deeply than those who are not redeemed:

We are now capable of a joy which unfallen spirits could not have known: the bliss of pardoned sin, the heaven of deep conscious obligation to eternal mercy.

The bonds which bind redeemed ones to their God are the strongest which exist. I believe that forgiven sinners will have a love to God and to his Christ such as cherubim and seraphim never felt; Gabriel cannot love Jesus as a forgiven man will do.

Those who have washed their robes and made them white in the blood of the Lamb will be nearer and dearer to him, and he will be nearer and dearer to them, than all the ministering spirits before the throne. [Spurgeon, HT: Of First Importance.]

“For this reason I say to you, her sins, which are many, have been forgiven, for she loved much; but he who is forgiven little, loves little” (Lk. 7:47; NASB).