Raising our voices is easier than getting up, walking over, and administering firm but loving correction at the first sign of disobedience. But God will help us if we let him. Self-control involves the ability to do the right thing at the right time. And the right time for correction is at the moment of disobedience. When we allow the Spirit of God to deal with our problem of laziness, we shall be able to discipline our children his way.
Consistency also involves changelessness in maintaining our standards.
This is the way God deals with us. Rules must be flexible, and exceptions will be made in extenuating circumstances. But generally speaking, if we are going to insist on a certain code of behavior one day, then we ought to insist on it the next day as well. To require it one time and ignore it another bewilders children. Conversely, to let them get away with something most of the time, then suddenly to punish them for it in a fit of anger, defeats our aim of teaching them self-discipline.