When Adam hid under a bush, it wasn't from Eve, but from God. This feeling, so universal and unavoidable, is shame. According to inner child theorists, the key to release from shame is entering into my own pain and rage. By finally feeling in a deep way my own feelings rather than the feelings of my parents, I differentiate my ego from the ego-mass of my family. But this theory is not proven.
Some people appear to dwell on their pain and rage in a way that is quite destructive.
Such an emphasis need not imply that Christians should practice denial. Paul, Christ and others in Scripture acknowledged they felt pain. It is rather a call to recognize the balance in Scripture, which is heavily weighted in the direction of our need to resist our native negativity, lack of gratitude and self-centeredness. Christians have to think about themselves, just like everyone else. But there is such a thing as self-absorption in the negative sense, and this is a form of setting our minds on the things of the flesh.