St Faustina writes in her Diary 113..
I would like to say three words to the soul that is determined to strive for sanctity and to derive fruit; that is to say, benefit from confession.
First word - complete Sincerity and Openness. Even the holiest and wisest confessor cannot forcibly pour into the soul what he desires if it is not sincere and open. An insincere , secretive soul risks great dangers in the spiritual life, and even the Lord Jesus Himself does not give Himself to such a soul on a higher level, because He knows it would derive no benefit from these special graces.
Second word - Humility. A soul does not benefit as it should from the sacrament of confession if it is not humble. Pride keeps it in darkness. The soul neither knows how, nor is willing, to probe ..the depths of its own misery. It puts on a mask and avoids everything that might bring it recovery.
Third word - Obedience. A disobedient soul will win no victory, even if the Lord Jesus himself, in person, were to hear its confession (113)
* * * * *