The imitation of Christ, the 1st book: chapter xxv (of the zealous amendment of our whole life)

OF THE ZEALOUS AMENDMENT OF OUR WHOLE LIFE “Be you watchful and diligent in God's service and bethink you often why you have renounced the world. Was it not that you might live to God and become a spiritual man? Be zealous, therefore, for thy spiritual profit, for you shall receive shortly the reward of [...]