The interpretation timeline
Luke 9:21 Douay-Rheims

But he strictly charging them, commanded they should tell this to no man.

A.D. 397 – 1771 3 witnesses

Patristic

before A.D. 750
397
A.D.
Ambrose of Milan Patristic
A.D. 339–397
“But our Lord Jesus Christ was at first unwilling to be preached, lest an uproar should arise; as it follows, And he straitly charged them, and commanded them to tell no man any thing. For many reasons He commands His disciples to be silent; to deceive the prince of this world, to reject boasting, to teach humility. Christ then would not boast and dost thou boast who art of ignoble birth? Likewise He did it to prevent rude and as yet imperfect disciples from being oppressed with the wonder of this awful announcement. They are then forbid to preach Him as the Son of God, that they might afterwards preach Him crucified.”
Source
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“(Hom. 54. in Matt.) Timely also was our Lord’s command that no one should tell that He was Christ, in order that when offences should be taken away and the sufferings of the cross completed, a proper opinion of Him might be firmly rooted in the minds of the hearers. For that which has once taken root and afterwards been torn up. when fresh planted will scarcely ever be preserved. But that which when once planted continues undisturbed, grows up securely. For if Peter was offended merely by what he heard, what would be the feelings of those many who, after they had heard that He was the Son of God, saw Him crucified, and spit upon?”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Saying, the son of man must suffer many things,.... In his person and character, in his soul and body, at the hands of God, and of men, and devils: and be rejected of the elders, and chief priests, and Scribes; who made up the grand sanhedrim of the nation: by these he was to be, and was rejected as the Messiah; and when put up with another which should be released, that other should be preferred, and he rejected; and which was done at the instigation of these men, who were the builders; of whom it was foretold that they should reject the head stone of the corner, Psa 118:22 and be slain; or put to death, with the death of the cross: and be raised the third day; according to the types and prophecies of the Old Testament. This he added for the comfort of his disciples.”
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.