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?