Theophylact of Ohrid

For if the Romans have done this to Me, a moist tree, fruit-bearing, ever green and ever living by the power of the Godhead, and nourishing all with the fruits of My teaching, what will they not do to you, that is, to the people, a dry tree, deprived of all life-giving righteousness and bearing no fruit? If you had any life-giving power of goodness, perhaps you would have been deemed worthy of at least some mercy; but now, like a dry tree, you will be subjected to burning and destruction.

Commentary on Luke ↗

Gregory the Dialogist

He has called Himself the green wood and us the dry, for He has in Himself the life and strength of the Divine nature; but we who are mere men are called the dry wood.

Catena Aurea by Aquinas ↗

Bede

For if they do these things to the green wood, what will happen to the dry one? The green wood signifies himself and his chosen ones, while the dry one signifies the impious and sinners. Therefore, if I, he says, who have not committed sin, who has rightly been called the tree of life, bring forth the fruits of grace twelve times a year, without leaving the world without the fire of passion, what torment do you think awaits those who are empty of fruits and furthermore do not fear to give the very tree of life to the flames? …

On the Gospel of Luke ↗

Bonaventure

But that such horrible days are to be awaited without doubt, dreaded, and anticipated with weeping, he shows from the consideration of his own passion, when he adds: For if they do these things in the green wood, what will be done in the dry? As if to say: if a living, fruitful, and beautiful tree is cut down, what then will become of the dry and unfruitful one? …

Commentary on Luke, Chapter 23 ↗