Mark the Ascetic - On the Spiritual Law 33-38

33. When we are compelled by our conscience to accomplish all the commandments of God, then we shall understand that the law of the Lord is faultless (cf. Ps. 19:8. LXX). It is performed through our good actions, but cannot be perfected by men without God's mercy.
34. Those who do not consider themselves under obligation to perform all Christ's commandments study the law of God in a literal manner, 'understanding neither what they say nor what they affirm' (1 Tim. I :7). Therefore they think that they can fulfill it by their own works.
35. There are acts which appear to be good, but the motive of the person who does them is not good; and there are other acts which appear to be bad, while the motive of the doer is good. The same is true of some statements. This discrepancy is due sometimes to inexperience or ignorance, sometimes to evil intention, and sometimes to good intention.
36. When a man outwardly praises someone, while accusing and disparaging him in his heart, it is hard for the simple to detect this. Similarly a person may be outwardly humble but inwardly arrogant. For a long time such men present falsehood as truth, but later they are exposed and condemned.
37. One man does something apparently good, in defense of his neighbor; another, by not doing it, gains in understanding.
38. Rebukes may be given in malice and self-defense, or out of fear of God and respect for truth.