Ambrose of Milan

Then, intending to ask for peace from his brother, Jacob slept in the encampment. Perfect virtue possesses tranquility and a calm steadfastness; likewise the Lord has kept his gift for those who are more perfect and has said, "My peace I leave to you, my peace I give to you." It is the part of those who have been perfected not to be easily influenced by worldly things or to be troubled with fear or tormented with suspicion or stunned with dread or distressed with pain. …

On Jacob and the Blessed Life ↗