After witnessing Christ's death, we experience a frozen scene -- an aria -- which is a space for reflection that Bach so often gives us in his cantatas and passions. But this time we also experience some harsh tonal whiplash as first we hear Christ's head falling in death, then a dancing, hopeful aria. This aria with interspersed chorale is filled with questions, and the positivity of one final answer.
Bach produces an innovative and complex "theological counterpoint" of the bass aria's poetry with the simultaneous chorale text. The answer is a confident affirmative; the bass holds a moment and then nods "ja." And so, our question "can I inherit the kingdom of heaven? Is this the redemption of the world?" is answered: as Christ lowered his head in death, he silently bowed his head "yes."