Note; the parallels are mainly contrastive.
A. 18:1 And he spake a parable unto them to this end, that men ought always to pray, and not to faint;
B. 2 Saying, There was in a city a judge, which feared not God, neither regarded man: 3 And there was a widow in that city; and she came unto him, saying, Avenge me of mine adversary. 4 And he would not for a while:
C.i. but afterward he said within himself,
ii. Though I fear not God, nor regard man; 5 Yet because this widow troubleth me, I will avenge her,
iii. lest by her continual coming
iv. she weary me.
C’.i. 6 And the Lord said, Hear what the unjust judge saith.
ii. 7 And shall not God avenge his own elect,
iii. which cry day and night unto him,
iv. though he bear long with them?
B’. 8 I tell you that he will avenge them speedily.
A’. Nevertheless when the Son of man cometh, shall he find faith on the earth?
Interesting to get a clearer picture of what was in Luke’s mind with regard to the Son of Man coming and finding faith on the earth.
Some might think the lack of faith implied the lack of the presence of the church at the end of the age. Yet vs 1 makes it clear, it has everything to do with the faith of living Christians, persevering in prayer (probably in the midst of end time trials that would otherwise tempt them to give up/faint).