Louis G. Rylands
pointed out a strong evidence that the Odes were written before the 70 CE:
His [of the author of the Odes] universalistic outlook is indeed apparent in the extracts already given. An indication of this can be seen particularly in Ode XXXVIII, where the idea of planting " has clearly been suggested by Ps. xcii, 13-15. But the expressions "house of the Lord" and "courts of our God" are carefully avoided as signifying the temple of Yahveh at Jerusalem. The writer substitutes "hand of the Lord." Another distinction found here is also important. For the Psalmist life was ended with the death of the body, so that "fruit-bearing" could not in his view continue later than " old age." The Odist, who believed in the continuous life of the spirit, corrected his statement into " its fruits are for ever."
(Beginning of Gnostic Christianity
, p. 34-35, my bold)
The writer had need to avoid any reference to the temple of Jerusalem only if
that temple was seen as a serious rival, i.e., only if
it was still standing and not destroyed by the Romans. Because otherwise it would be very strange to explain why he didn't quote the Psalm by writing also ''house of the Lord'' and/or ''courts of our God'': afterall,
he could imagine them as references to a celestial
temple, in the absence
of a physical temple in Jerusalem. Evidently that absence was not there.
The Psalm in question:
The righteous will flourish like a palm tree,
they will grow like a cedar of Lebanon;
planted in the house of the Lord,
they will flourish in the courts of our God.
They will still bear fruit in old age,
they will stay fresh and green,
proclaiming, “The Lord is upright;
he is my Rock, and there is no wickedness in him.”
The Odes based on that Psalm:
I went up to the light of truth as if into a chariot;
and the truth took me and led me. From the rocks and
the waves it preserved me; and it brought me to the
haven of salvation. My foundations were laid
on the hand of the Lord; be
cause he established me. For he set the root and watered
it and fixed it and blessed it; and its fruits are for ever.
And the Lord alone was glorified in his planting and his