Flaws - how to understand them, and overcome them.
Cardinal Newman's best 5 essays on the human condition and sin.
"For it is in proportion as we search our hearts and understand our own nature, that we understand what is meant by an Infinite Governor and Judge; in proportion as we comprehend the nature of disobedience and our actual sinfulness, that we feel what is the blessing of the removal of sin, redemption, pardon, sanctification, which otherwise are mere words. God speaks to us primarily in our hearts."
"No one perhaps, is entirely ignorant of himself; and even the most advanced Christian knows himself only 'in part.' However, most men are contented with a slight acquaintance with their hearts, and therefore a superficial faith."