Isaiah 10:15

Let us consider therefore those to whom God has granted power, to see if we may deserve to serve them and to cling to their doctrine, putting aside all pride and resisting with great courage the sin, which fearlessly operates in bodies; for death has been swallowed up by victory. On the other hand, how weak we are in this age, knowing that the church is to stand and to be led toward what is good.… You know that the ax does not boast without the man who uses it to cut … but we must fight to be able to have peace with those who keep the commandments of God.

For you, Sennacherib, are the ax in the hands of him that cuts, and you are the saw in the hands of him that saws, and the rod in the hand of him that wields you for chastisement, and you are the staff for smiting. You are sent against the fickle people, and again you are ordained against the stubborn people, that you may carry away the captivity and take the spoil; and you have made them as the mire of the streets for all people and for all the Gentiles. And when you have done all these things, why are you exalted against him who holds you, and why do you boast against him who saws with you, and why have you reviled the holy city?

(Verse 15.) Will the axe boast against the one who hews with it, or the saw exalt itself against the one who draws it? As if a rod should raise itself against the one who lifts it, or a staff should exalt itself, which is only wood. In response to Sennacherib, or as many believe, Nebuchadnezzar, boasting and saying: 'By the strength of my hand I have done it, and by my wisdom, for I have understanding,' the holy Prophet replied: 'O most foolish of mortals, do you think God's wrath is your wisdom, and His command is your strength?' How can an axe boast against the one who wields it, or a saw against the one who draws it? And let them say, all the works done by the axe and the saw are perfected by their own skill. And if someone lifts a staff and raises a stick to strike whoever they desire, and that staff and stick boast, saying that they themselves have struck the one who was struck: in the same way, when you are an instrument of God's will, you elevate yourself in pride and glory in everything that is done as your own virtue. But whatever is said to be Assyrian can also be referred to the pride of heretics and to the devil, who is called an axe, a saw, and a rod in the Scriptures, because through him unfruitful trees are cut down and divided, and the hardness of unbelievers is sawn, and those who do not receive discipline are struck with a rod. The heretics, whose mouth is set against heaven and whose tongue stretches to the ground, twist the meaning they have received from God in a good way and use it for the opposite and perverse, so that they speak against the one by whom they were created, and they turn the ministry of tongues, by which the Lord is to be praised, into blasphemy (Psalm 72).