I was visiting today with one of my brothers in Christ about unworthiness. Sometimes our knowledge of our own sin keeps us from serving God in gladness. That is human, but only in the sense that we are fallen creatures. In fact, convincing us of our unworthiness is one of Satan's greatest tools. If he can convince you or me that our sin is too great to make us useful to God or for his purposes, he is able to negate God's love working in and through us. What sin can God not forgive? According to my reading of the scriptures it is only the sin of blasphemy against the Holy Spirit which is refusing to accept God in all his power and glory and, yes, ability to dispense grace that is greater than our sin.
God was able to use a liar and cheat like Abraham, a coward like Gideon, a murderer like David, a Christian killer like Saul of Tarsus; I believe with all my heart that he can use people like you and me. The knowledge that God can heal us of our sins should drive us to greater thanksgiving for the power of God's love. Even in our sin, God can find purpose for our broken lives. Is that not proof of his miraculous power in days such as these? Confess your sin, believe in his power to save, seek his will for your life, believe that he can do miracles in and through you.
"Out of the depths I cry to you, O Lord; O Lord, hear my voice. Let your ears be attentive to my cry for mercy. If you, O Lord, kept a record of sins, O Lord, who could stand? But with you there is forgiveness. Put your hope in the Lord, for with the Lord is unfailing love and with him is full redemption."
Praise be to God who is our rock and our redeemer. In him is our hope for this life and for all of eternity.