Luke 18:1

He gave them an illustration to show that they must always pray and not give up,

Philippians 4:6

Have no anxiety about anything, but make all your wants known to God in prayer and entreaty, and with thanksgiving.

Colossians 4:2

Be persistent in prayer and wide awake about it when you give thanks.

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
He gave them an illustration to show that they must always pray and not give up,
Philippians 4:6
Have no anxiety about anything, but make all your wants known to God in prayer and entreaty, and with thanksgiving.
Colossians 4:2
Be persistent in prayer and wide awake about it when you give thanks.