keep on...

Luke 11 

9 “And so I tell you, 

keep on asking, 

and you will receive what you ask for. 

Keep on seeking, 

and you will find. 

Keep on knocking, 

and the door will be opened to you. 

10 For everyone who asks, 

receives. 

Everyone who seeks, 

finds. 

And to everyone who knocks, 

the door will be opened.

(But do you do if you just don't have the strength to "keep on..."?)