"Jerome, when writing to a sick friend, said this - 'I account it a part of unhappiness not to know adversity; I judge you to be miserable, because you have not been miserable.' 

Freedom from punishment is the mother of security, the step-mother of virtue, the poison of religion, the moth of holiness, [Bernard] 

God's corrections are our instructions, His lashes our lessons, His scourges our schoolmasters, His chastisements our advertisements." Sanctified afflictions opens men's ears to discipline, and turns them from iniquity, which is a piece of learning that a Christian can never pay too dear for." Thomas Brooks.