Irreconciable War

The fact that the devil is everywhere called God's adversary and ours also ought to fire us to an unceasing struggle against him. For if we have God's glory at heart, as we should have, we ought with all our strength to contend against him who is trying to extinguish it. If we are minded to affirm Christ's Kingdom as we ought, we must wage irreconcilable war with him who is plotting its ruin. Again, if we care about our salvation at all, we ought to have neither peace nor truce with him who continually lays traps to destroy it. (Institutes 1.14.15)