"It's always too early to quit. "

Have you heard the saying, "Keep on keeping on"? Norman Vincent Peale said it slightly differently, "It's always too early to quit."  It pretty much means the same thing.  If you seek success in anything, the road there is continued effort. 

You need sustained forward movement because the moment you stop, your plans to come back may never happen.  It is easy to postpone your work until later. Unfortunately “later” often never comes.

To achieve your goals and dreams, never quit, never give up.  Even if you have been struggling for a long time, it is still "too early to quit".  The best results are often just beyond the point you think you can go no farther. 

Put the effort and energy into whatever you do and work through to completion of the task.