The interpretation timeline
Zechariah 8:6 Douay-Rheims

Thus saith the Lord of hosts: If it seem hard in the eyes of the remnant of this people in those days: shall it be hard in my eyes, saith the Lord of hosts?

1105 – 1875 6 witnesses

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
“As it will be wonderful in their eyes, the great loving-kindness that I will do for them. it will also be wonderful in My eyes how I returned from the great wrath. And our Sages expounded on [this phrase], concerning the slaughter of the evil inclination, in tractate Sukkah (52a): it will also be wonderful in My eyes how the righteous will be able to stand up against [the evil inclination] during their lifetime.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Thus saith the Lord of hosts, Behold,.... As being something wonderful, of great importance, and deserving attention: I will save my people from the east country, and from the west country; this can not be understood of bringing those Jews that remained in Babylon, and other places, to their own land, for Babylon lay north of Judea; see Zac 6:6, and as yet there were no Jews in the western part of the world; but now they are chiefly in the east and west, from whence they will be gathered at the time of their general conversion; though this may refer to the times of the apostles of Christ, and to their ministry in the several parts of the world, who went forth, east, west, north, and south, and were the means and instruments of saving the Lord's people, both Jews and Gentiles, wherever they came, from the rising of the sun, to the setting of the same; see Mal 1:11.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“If it be marvellous - You may think that this is impossible, considering your present low condition: but suppose it be impossible in your eyes, should it be so in mine! saith the Lord of hosts.”
1849
A.D.
1774–1849
“Days. If no prospect of such happiness now appear, is any thing difficult to Omnipotence? (Haydock) (Luke i. 37.)”
1871
A.D.
1871
“However impossible these things just promised by Me seem to you, they are not so with God. The "remnant" that had returned from the captivity, beholding the city desolate and the walls and houses in ruins, could hardly believe what God promised. The expression "remnant" glances at their ingratitude in rating so low God's power, though they had experienced it so "marvellously" displayed in their restoration. A great source of unbelief is, men "limit" God's power by their own (Psa 78:19-20, Psa 78:41). these days--"of small things" (Zac 4:10), when such great things promised seemed incredible. MAURER, after JEROME, translates, "in those days"; that is, if the thing which I promised to do in those days, seems "marvellous," &c.”
Source
1875
A.D.
Keil & Delitzsch Lutheran
1861–1875
“"Thus saith Jehovah of hosts, If it be marvellous in the eyes of the remnant of this nation in those days, will it also be marvellous in my eyes? is the saying of Jehovah of hosts." The second clause of this verse is to be taken as a question with a negative answer, גּם for הגם, as in Sa1 22:7, and the meaning is the following: If this (what is promised in Zac 8:3-5) should appear marvellous, i.e., incredible, to the people in those days when it shall arrive, it will not on that account appear marvellous to Jehovah Himself, i.e., Jehovah will for all that cause what has been promised actually to occur. This contains an assurance not only of the greatness of the salvation set before them, but also of the certainty of its realization. "The remnant of the nation," as in Hag 1:12-14.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.