Luke 18:1

THEN he spake also to them a parable, to shew that we ought to pray always, and not faint;

Philippians 4:6

Be not anxious about any thing, but in every case by prayer and supplication, with thanksgiving, let your petitions be made known unto God.

Colossians 4:2

Persevere in prayer, watching therein with thanksgiving;

Treasury of Scripture Knowledge

Summary

Because he hath inclined his ear unto me, therefore will I call upon him as long as I live.

Bible References

Therefore

Luke 18:1
THEN he spake also to them a parable, to shew that we ought to pray always, and not faint;
Philippians 4:6
Be not anxious about any thing, but in every case by prayer and supplication, with thanksgiving, let your petitions be made known unto God.
Colossians 4:2
Persevere in prayer, watching therein with thanksgiving;