I thought
Thingol grew wiser as time passed: less proud, less arrogant, until he slipped at the end.
His experience with
Beren softened his heart toward
Men. He loved
Turin as a son, as his great-great-grandson
Elrond would later love
Aragorn as a son. He welcomed
Húrin after his release from the bondage of
Morgoth, endured his taunts and barbs without anger, and by his mercy and kindness finally released Húrin from the twisted worldview Morgoth had slowly imposed upon him by allowing Húrin to see only what Morgoth chose. (A warning about the dangers of propaganda, I suppose.)
But as
Melian foresaw, by trying to remove Beren from
Lúthien’s life by sending him on a seemingly hopeless quest for a Silmaril, Thingol ensnared himself in the Curse of the
Noldor. Not only did he lose his daughter – she became mortal, and when she died after her father, she left
Arda, going where he could not follow – he himself came to lust for – to desire to possess – the Silmaril.
Unfortunately for Thingol, the
Dwarves of Nogrod also fell to lusting for the Silmaril, particularly after they worked it into the Nauglamír, which Húrin brought from ruined
Nargothrond to taunt Thingol. His pride reawoke. The pride of the Dwarves was already kindled, and as they outnumbered him, they slew him in his own deep mansions.
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As an aside, notice that
Celeborn and
Galadriel appear to have patterned their relationship as rulers after that of Thingol and Melian. Galadriel says that Celeborn is “the wisest of the
Elves of
Middle-earth, and a giver of gifts beyond the power of
kings.” Yet like Melian, she is both wiser and more powerful than her husband. (Elsewhere, btw,
Tolkien said that
Círdan was the wisest of the Elves of Middle-earth. And Elrond is wisest in another account, I believe. Lots of wise old Elves.) She prevents
Sauron’s minions from entering
Lórien with a barrier that might be reminiscent of the
Girdle of Melian. Her daughter’s daughter looks like Melian’s daughter and shares her choice of Mortality. She gently and nobly remonstrates her husband when Celeborn exclaims fear of the
Balrog in a fashion that recalls Melian’s gentle yet pointed chiding of Thingol when he demands a Silmaril of Beren. Melian seems to have mentored Galadriel during her stay in
Doriath, and Galadriel seems to have proved an excellent student.