Here are the possible solutions for the of the moral universe is long but it bends toward justice m l k clue
Answer
Clue
Relevancy
arc
Clue
"The ___ of the moral universe is long, but it bends toward justice": M.L.K.
Definition
a part of the circumference of a circle or other curve
eon
Clue
Long long long long long long long time
Definition
a long period of time, also AEON
etaoin
Clue
"___ shrdlu" (nonsense phrase of old type-setting lore which has an interesting backstory but I can't do it justice in the space of a single clue even a long one like this so yeah it's just kind of a