To keep the soul continually in a state of gentle calm, it is necessary to perform every action as being done in the presence of God, and as if He Himself had ordained it. -St. Francis de Sales
This is the reason why St. John Berchmans performed all his actions so regularly, and was so even-tempered on all occasions, without any alteration or perturbation. It was because he constantly enjoyed the Divine presence, and was accustomed before beginning any action, to plan it with God, and to remain in His sight while doing it.
When one of the Fathers of the Desert was asked how he contrived to lead a life so well-ordered and so perfectly even, he answered: “I keep my eyes always upon my guardian angel, who stands ever at my side, assisting me in every work, teaching me in all circumstances what I have to say and do, and noting carefully every one of my actions. Thence arise in me such fear and respect for him, as make me ever attentive not to say or to do anything that can displease him.”
Text from A Year With the Saints (New York: P.J. Kenedy & Sons, 1891).