Mistakes and Corporate Worship

"The church has spent so much time inculcating in us the fear of making mistakes that she has made us like ill-taught piano students; we play our songs but we never really hear them because our main concern is not to make music, but to avoid some flub that will get us in dutch...I have now heard the strains of grace, and I grieve for my friends who have not".

Philip Yancey, What's So Amazing About Grace?