We must pray always. Luke 18:1-8

1 And he spoke also a parable to them, that we ought always to pray, and not to faint, 2 Saying: There was a judge in a certain city, who feared not God, nor regarded man.

3 And there was a certain widow in that city, and she came to him, saying: Avenge me of my adversary.

4 And he would not for a long time. But afterwards he said within himself: Although I fear not God, nor regard man,

5 Yet because this widow is troublesome to me, I will avenge her, lest continually coming she weary me.

6 And the Lord said: Hear what the unjust judge saith.

7 And will not God revenge his elect who cry to him day and night: and will he have patience in their regard?

8 I say to you, that he will quickly revenge them. But yet the Son of man, when he cometh, shall he find, think you, faith on earth?
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[3 "Avenge"... That is, do me justice. It is a Hebraism.]