Truly, the fruits of the Spirit are the greatest evidence that we are saved and they are the "doing" of the Spirit Himself: love, joy, peace, patience, kindness, goodness, gentleness, faithfulness and self-control (Gal 5, Matt 7)
All of these fruits are present in our words, demeanor, behavior towards others, etc. but we must not take credit for them.
Then why do you repeat Luther's spin on the very clear gospel?