From Arvo Part's wikipedia article:
In this context, Pärt's biographer, Paul Hiller, observed that "[Pärt] had reached a position of complete despair in which the composition of music appeared to be the most futile of gestures, and he lacked the musical faith and will-power to write even a single note."
Like Andrei Rublev.
That film grows more fundamentally true with every passing day.
Andrea Mantegna is a painter. More here.
Arvo Part is a composer. More information here. More music here.