In the Eastern Orthodox Church, Gregory the Great (590-604) is usually called Saint Gregory Dialogus, Pope of Rome. The Liturgy of the Presanctified Gifts, which he compiled, is a service that we use on weekdays during Lent. You can read about his other writings and inspiring life, including several quotes from the saint, on this site. Here is one of the quotes, fitting for Lent:

“Every day you provide your bodies with good to keep them from failing. In the same way your good works should be the daily nourishment of your hearts. Your bodies are fed with food and your spirits with good works. You aren’t to deny your soul, which is going to live forever, what you grant to your body, which is going to die.”

I only recently began to learn about St. Gregory, after reading this poem by him:

DIVINE CREATOR OF THE LIGHT

Divine creator of the light,
Who, bringing forth the golden ray,
Didst join the morning with the night
And call the blessed union day;