St. Tikhon of Moscow offers some thought on how to prepare for Confession by examining your own conscience. These are questions we can ask ourselves to help us know what it is we have to confess at the sacrament.
“And that is why the Fathers of the Church persistently command Christians to be sober, attentive to themselves, to their thoughts, words, and deeds. ‘Every evening,’ says St. Ephrem the Syrian, ‘enter your heart, reflect, and ask yourself,
“Have I offended God in any way?
Have I spoken an idle word?
Have I been negligent?
Have I offended my brother?
Have I judged someone?
When I opened my lips to glorify God, did my soul become dispersed among worldly things?
When sensuality awakened in me, did I take pleasure in it?
Was I carried away by earthly cares?”
If in all of these things you suffered failure, try to make up for it; sob, cry, in order not to suffer failure again.’” (St. Tikhon of Moscow: Instructions and Teachings for the American Orthodox Faithful (1898-1907), Kindle Loc. 1154-1159)