That quote appears to be someone's summation. I'm not quibbling with the wording but just to post Tolkien's actual phrasing...
Quote:
This supposition would indeed explain the air of special power and sanctity that surrounds Glorfindel (...)
(...) We can thus understand why he seems so powerful a figure and almost 'angelic'. For he had returned to the primitive innocence of the First-born, and had then lived among the Elves who had never rebelled, and in the companionship of the Maiar for ages, to the end of the first millennium of the Third Age: before he returned to Middle-earth.
JRRT, Last Writings, The Peoples of Middle-Earth, Glorfindel I
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That is Glorfindel I however, as Tolkien would revise that Glorfindel remained in Aman until the Third Age. And in Glorfindel II the wording is a bit different...
Quote:
He then became again a living incarnate person, but was permitted to dwell in the Blessed Realm; for he had regained the primitive innocence and grace of the Eldar. For long years he remained in Valinor, in reuinion with the Eldar who had not rebelled, and in the companionship of the Maiar. To these he had now become almost an equal, for though he was an incarnate (to whom a bodily form not made or chosen by himself was necessary) his spiritual power had been greatly enhanced by his self-sacrifice.
JRRT, Last Writings, Glorfindel II
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Here Glorfindel returns in the Second Age rather, and 'more probably' as late as c. 1600 Second Age, the Year of Dread.