On Guarding the Intellect

Brief extracts from a longer work, transmitting the raw, practical wisdom of the Egyptian desert. Isaiah's advice centers on rebutting destructive thoughts at their first arising and attending carefully to the conscience. The style is terse and unadorned — instructions from a practitioner who has no interest in literary polish. These fragments are foundational to the Philokalia's teaching on inner vigilance and represent some of the earliest systematic guidance on the guarding of the intellect.