Sometimes when I practice

It seems like I'm going no where - that I'm not improving at all, that I'm continually making the same mistakes and why am I wasting my time. Then other times when I practice, everything seems to fall into place and the music sounds like music. Tonight was one of the latter experiences :) which makes me happy. My hope is that the more I practice, the more I'll have experiences like tonight instead of the frustration. In any case, that's why I stick with it. Maybe I'll go back and do some more practice.