It is impossible for us to have good thoughts, good words or good actions when our essence is evil.   

Why do sinners sin?   Because they ARE sinners.   

This is why we need a New Spirit which manifests in Spirit Salvation.   

Jesus answered, Truly, truly, I say unto you, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of heaven. Joh 3:5 The Sin Nature must be destroyed and replaced with a New Spirit which exists in the Kingdom Of Heaven.      The Kingdom Of Heaven is the Spirit Realm, which is a dimension of existence higher than that of the space-time continuum in which all physical life exists.      It is not possible for the purely physical to exist in the Spirit Realm.     This is why we must be born of the Spirit.      Being Born Of Water means being born into humanity.     Angels cannot experience the Kingdom Of Heaven in themselves as Born Again humans may Luk 17:21.      If there is any confusion about the birth by water being Water Baptism the next verse clears it up.     He connects the water with the flesh.

And be renewed in the spirit of your mind; Eph 4:23 The spirit of a person is the motivator of that person.     It is the inspiration of that person.      The mind is that part of a person which gains, stores and processes information.     It is by default only affected by the 5 senses.      In the New Birth we receive a new, perfect spirit.     This is Spirit Salvation.      But our mind still holds the same information, opinions and tendencies it did before we were Born Again.      In order to experience the benefits of Abundant Life our minds must be transformed, renewed so that the Mind Of Christ in our New Spirit takes over our mind.      The Word and the Holy Spirit are the ingredients which enable our minds to be transformed.     But we must expose our minds to the Word and we must surrender our minds to the Holy Spirit in Prayer Language for this to happen.      To the extent we do this, our minds are renewed and we experience Soul Salvation.      Our minds will never be completely transformed in this life.     We press toward the mark Phi 3:14.      At the return of Christ the corruptible will put on incorruption and our Soul Salvation will be complete 1Co 15:50-54.