A "good confession" means honestly admitting to something you did wrong, taking responsibility for it, and expressing regret for your actions. Full definition
To those on the outside, the great majority of the human race, what he calls theology will appear at best the confession of the faith of one community among others. (religion-online.org)
... I charge you in the presence of God, who gives life to all things, and of Christ Jesus, who in his testimony before Pontius Pilate made the good confession, to keep the commandment unstained and free from reproach until the appearing of our Lord Jesus Christ. (nakedpastor.com)
BUT before that, I would recommend that you go and do a good confession... And please, learn more about your faith and the Holy Scriptures.. (religion.blogs.cnn.com)