Ambrose of Milan
Catena Aurea · Lukasevangelium 4
And Jesus being full of the Holy Ghost returned from Jordan, and was led by the Spirit into the wilderness, Being forty days tempted of the devil. And in those days he did eat nothing: and when they were ended, he afterward hungered. And the devil said unto him, If thou be the Son of God, command this stone that it be made bread. And Jesus answered him, saying, It is written, That man shall not live by bread alone, but by every word of God.
There are three things which united together conduce to the salvation of man; The Sacrament, The Wilderness, Fasting. No one who has not rightly contended receives a crown, but no one is admitted to the contest of virtue, except first being washed from the stains of all his sins, he is consecrated with the gift of heavenly grace.