For the glory of God…

Do everything for the glory of God, and in no thing – either outwardly nor inwardly – intend anything other than this glory. It should be the measuring stick of every endeavor and place its seal on each one.
— Saint Theophan the Recluse (1815-1894)

Give an account of yourself…

No matter who you are, what kind of work you do, give an account of yourself as to how you have performed your work: as a Christian, or as a heathen (that is, motivated by self-love and worldly pleasure). A Christian must remember that every deed, even the smallest, has a moral principle. A Christian, who remembers the teaching of Jesus Christ, should perform every deed so that it will be of use toward the spreading of the grace of God and the Kingdom of Heaven among men.
— Saint Gabriel of Imereti (1825-1856)

The real Christian temper…

This power of being outwardly genial and inwardly austere, which is the real Christian temper, depends entirely upon the time set apart for personal religion. It is always achieved if courageously and faithfully sought; and there are no heights of love and holiness to which it cannot lead.
— Evelyn Underhill (1875-1941)