The interpretation timeline

Tob 8:9

How this passage has been read — the sources, oldest to newest.

From the early Church Fathers to now.

Tob 8:9 · Douay-Rheims
“And now, Lord, thou knowest, that not for fleshly lust do I take my sister to wife, but only for the love of posterity, in which thy name may be blessed for ever and ever.”
Post-Reformation c. 1650 – 1900
1849
A.D.
1774–1849
“Only. Greek, “for truth,” resolving to be ever faithful to her. (Haydock) — We cannot read the pure sentiments of Tobias and Sara, brought up in the midst of infidels, without surprise. Nothing more perfect could be required of Christians (Calmet) in the married state. (Haydock) — St. Augustine (Doct. x. and xviii.) adduces this text to shew the true intent of marriage.”
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.