There will be times when you’re not fully prepared. It may be due to illness, laziness or circumstances outside your control. The question is: should you go ahead regardless? You might have missed several rehearsals, but a concert is coming up. You might not have put enough time into preparing a song to teach. You might unexpectedly be called upon to lead a song, but have had very little notice. Or you might have promised to write a song for a choir, but not found the time to finish it. There’s always an excuse: illness, family emergency, procrastination, forgetfulness, bad...