I love listening to Radio Head's 'Everything in its Right Place' because it's all major chords, it makes you feel really good. It's soothing, it's got a beautiful voice, crazy textures. When I'm down I listen to that song and it really makes me feel good.
As long as a word remains unspoken, you are its master; once you utter it, you are its slave.
If you're playing within your capability, what's the point? If you're not pushing your own technique to its own limits with the risk that it might just crumble at any moment, then you're not really doing your job.