The will is a beast of burden. If God mounts it, it wishes and goes as God wills; if Satan mounts it, it wishes and goes as Satan wills; Nor can it choose its rider... the riders contend for its possession.
Martin LutherHereby we may understand that God, of His special grace, maketh the teachers of the gospel subject to the Cross, and to all kinds of afflicitons, for the salvation of themselves and of the people; for otherwise they could by no means beat down this beast which is called vain-glory.
Martin Luther