Winston Churchill was once asked what the secret to success was and he apparently replied:
"Never give up. Never ever ever ever ever ever ever ever give up. Never give up!"
Imagine you had a bucket of oysters and were told one had a pearl inside and you decided to find it.
You opened the first but sprained your thumb, you continued and on the fourth you cut your finger, you continued and on the tenth one you twisted your wrist - would you consider stopping?
My guess is no - you would just change the tools you were using.
If you're striving for something and it's not coming, continue, but maybe think about using different tools.