...through this man forgivness of sins is proclaimed to you. Acts13.38 ESV
Jesus taught frequently about forgivness. It is understandable that He would; His very coming was to secure our forgivness with God. He told us to pray for forgivness, to forgive those who sin against us, to even forgive our enemies and do good to them. He told the disciples to proclaim forgivness to the nations in His name.
Just as Jesus taught frequently about forgivness, we should frequently ask for and accept it. This is one of the reasons forgiveness is proclaimed, not was proclaimed. It is proclaimed because our need for it is a present tense thing. We sholud live in a spirit of confession but equally so in a spirit which humbly accepts His gracious forgiveness. This way our focus is on His power to forgive and not just our proclivity to sin.