In theory, there is no difference between theory and practice. In practice there is. — Yogi Berra
Failure is simply the opportunity to begin again, this time more intelligently. — Henry Ford
“An unfortunate thing about this world is that the good habits are much easier to give up than the bad ones.” W. Somerset Maugham...
Just because it's practice, doesn't mean it's "allowed" to be terrible. At least not intentionally.