The German catalyst of the Protestant Reformation, Martin Luther, was a devoting and loving father, but like all parents, he had his moments. Such moments were sometimes captured by his students who took notes of what he said even at the dining table. As related by a biographer, “When Luther looked at his family in 1538, he remarked,”
Christ said we must become as little children to enter the kingdom of heaven. Dear God, this is too much. Have we got to become such idiots? — Martin Luther 
Can you imagine what his children must have been up to at the time?
 Roland H. Bainton, Here I Stand: A Life of Martin Luther (Nashville: Abingdon Press, 2013), Kindle, 4224-4225.