Antirrhetikos - Evagrius
David Brakke’s Introduction to his translation of this key work by Evagrius of Pontus is well worth the read. In Evagrius I have found no one who more intensely thought about time as practice.
The Highest Poverty - Giorgio Agamben
The monastery perfected the structuring life through the rigorous measurement of time. This went well beyond simply organizing the day. How the monks spent their time became integral to their salvation, and a template for others.