True Christian fortitude consists in strength of mind, through grace, exerted in two things; in ruling and suppressing the evil and unruly passions and affections of the mind; and in steadfastly and freely exerting and following good affections and dispositions, without being hindered by sinful fear or the opposition of enemies... Though Christian fortitude appears in withstanding and counteracting the enemies that are without us; yet it much more appears in resisting and suppressing the enemies that are within us; because they are our worst and strongest enemies and have greatest advantage against us. The strength of the good soldier of Jesus Christ appears in nothing more than in steadfastly maintaining the holy calm, meekness, sweetness, and benevolence of his mind, amidst all the storms, injuries, strange behaviour, and surprising acts and events of this evil and unreasonable world.