Not much is said today (at least in my circles) of the old self other than that it exists and is to be killed. Those things are certainly true, but so much more can be said about what it is and how it can be undermined and replaced by the new self. I have a few reflections toward that end.
Paul uses the term "old self" to describe the remaining principle of indwelling sin that still lives in Christians (Romans 6:6; Ephesians 4:22; Colossians 3:9 and surrounding contexts).. Though it has been dethroned, it still exerts great power in deception and corruption.
My old self has a unique way of expressing independent falseness before God and others. The false self is one expression of the old self, the public expression intended to manipulate others to provide me what I want (affirmation, respect, etc.)
My old self "matrix" is an interconnected system of neural pathways, involving memories, fears, wounds and sins. Delicate self-reflection (usually only found in silence and solitude) is necessary to sort through what is what. Some elements need to be crucified/mortified immediately. Other elements need to be handled with great tenderness, being brought to the Lord for healing.
