this is my outlook on mastering the guitar our minds set a goal like say play 16th note 300bpm ounce we have spent years reaching playing this amazing speed your mind says ive mastered speed well you havent you can always go farther and use several techniques to branch out even more speed like hammer on pull offs ounce you practice that it seems like its mastered nope go to tapping learn to play it ive mastered it noooo you can always get better no matter what scales i learned them all well thats more then unlikely becuase their our a infinite number of scales out their the message im trying to get out their is mastering something is what our minds limit us to i would like to hear some feedback on your thoughts aswell and remember never stop learning or getting better :-)