Examine your conscience…

Carefully examine your conscience, then. Cleanse and purify it to the best of your power by true contrition and humble confession, that you may have no burden, know of no remorse, and thus be free to come near. Let the memory of all your sins grieve you, and especially lament and bewail your daily transgressions.
–Thomas à Kempis (1380-1471)

Forgiveness w/o Christ and the Church…

The Church is incapable of forgiving any sin without Christ, and Christ is unwilling to forgive any sin without the Church. The Church cannot forgive the sin of one who has not repented, who has not been touched by Christ; Christ will not forgive the sin of one who despises the Church. What God has joined together, man must not separate. This is a great mystery, but I understand it as referring to Christ and the Church.
–Blessed Isaac of Stella (Twelfth Century)

If you have sin…

Give God the greatest possible glory and honor Him with your whole soul. If you have a sin on your conscience, remove it as soon as possible by means of a good Confession.
–Saint John Bosco (1815-1888)