the more you play something, the more it takes on a personal meaning to you (which is probably quite different than someone else's). i am perfectly happy to keep my 'meanings' to myself, but when i come upon one that works for me - for some strange reason rarely change it. it might be something my teachers says that i want to remember (so i incorporate it in some kind of association). or, really unemotionally if i want to remember the notes - i make up words. or, if i am emotionally charged by it - tell myself 'it's just a song/piece, don't cry.' getting so many emotions from different pieces lets you experiment with sound. sometimes you just get a sound in your head (of what you want to hear) and it is an exercise just to make the phrases and piece turn into a 'painting of sound.' you need to, obviously, not be choppy - so striving to maintain a good speed helps in musicality, imo.
the most musical musicians, to me, tell a sort of story. you hear the beginning, the middle, and the end. they work together and you couldn't imagine the story being told in the shorter version (my teacher takes all repeats). enjoy the emphasis or change of emphasis at the repeats. make the end of your practice sessions performance sessions and try to please your 'pretend audience.' i've learned that taking your time is ok. don't rush (as most do) even between rests, between movements, and between one piece and the next piece.