Theologia Germanica

Many say they have no peace nor rest, but so many crosses and trials, afflictions and sorrows, that they know not how they shall ever get through them. Now he who in truth will perceive and take note, perceiveth clearly that true peace and rest lie not in outward things. There liveth no man on earth who may always have rest and peace without troubles and crosses. Wherefore yield thyself willingly to them, and seek only that true peace of the heart, which none can take away from thee, that thou mayest overcome all assaults.