The indwelling Ghost, I would suppose- The action (be it a change in lifestyle, temperament, charitable giving, etc) is the proof of the Spirit within.
And the Holy Spirit only indwells someone who believes. IOW, the desire to change, to do good works, is after the individual has been saved. The works may be rewarded, but they do not save the person.
John 15:5 I am the vine you are the branches. He who abides in Me, and I in him, bears much fruit; for without Me you can do nothing.
It is when we are in Jesus Christ that good deeds occur. The deeds will not make us a part of the vine.