STOP AND THINK – Freedom is not worth having if it does not connote freedom to err. (Mahatma Gandhi, leader of the independence movement in India)
Gandhi was thinking of freedom in a political context, but the principle holds true in a more personal way, too. Unless we allow people to make mistakes (e.g. our children, novices learning a new job, rookie athletes), we will hinder their opportunity to learn and to grow in new endeavors. Excellence is to be desired, but perfection cannot be required.
Whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable—if anything is excellent or praiseworthy—think about such things. (Philippians 4:8)