keeping 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.

So, let me ask this...

when is "keeping on..." a tireless discipline,

& after years & years of "keeping on...", when is it the vain babbling that God only finds annoying?