Luke 18:1

And he told them a parable to the effect that they ought always to pray and not lose heart.

Then Jesus told his disciples a parable to show them that they should always pray and not give up.

Now he told them a parable on the need for them to pray always and not give up.

And he told them a parable to show that they must always pray and not be discouraged,

And he spake a parable unto them to this end, that men ought always to pray, and not to faint;