Perseverance

Persistence in doing something despite difficulty or delay in achieving success (Oxford Dictionary).

Jesus said: 'Ask, and you will receive. Search, and you will find. Knock, and the door will be opened for you'. (Matthew 7:7).

Don't give up

If at first you don't succeed, try, try and try again

“It does not matter how slowly you go as long as you do not stop.” ¯ Confucius

“Never, never, never give in!” ¯ Winston S. Churchill

“It always seems impossible until it's done.” ¯ Nelson Mandela