In a recent post by John Piper titled “How I Approach God When Feeling Rotten” he writes:
Nothing changed until I began to get specific about my sins. Crummy feelings can be useful if they lead to conviction for sins. Vague feelings of being a bad person are not very helpful. The fog of unworthiness needs to take shape into clear dark pillars of disobedience. Then you can point to them and repent and ask for forgiveness and take aim to blow them up.