| “ | You have not yet achieved Kolinahr. He must search elsewhere for his answer. He will not find it with us. Live long and prosper, Spock. | „ |
| ~ T'Sai, telling Spock his answers lie elsewhere. |
T'sai was a female Vulcan introduced in the movie Star Trek: The Motion Picture. She was portrayed by Edna Glover.
By 2229, T'Sai was a Kolinahr master on Vulcan. In that year T'sai became the High Master after T'Rea was forced to give up the position due to her embrace of emotions. Among T'Sai's many duties was guiding those seeking Kolinahr through the process.
Sometime in the 2240s Sybok broke into the Hall of Ancient Thought by violating the mind of an elderly watcher, and stole the plans from that watcher's mind. Sybok found his mother T'Rea's katric ark and melded with it. T'Sai went to confront Sybok and found him unconscious in the Hall. T'Rea refused to return to the ark and embraced truth death instead. T'Sai informed Sybok that he had commmitted the most heinous of crimes, and banished Sybok from Vulcan.
In 2271 she learned that the renegade student Sekar had broken into the Hall of Ancient Thought and took the Mind Lord Zakal's katra into him in order to present the katra to the Romulans. Going to the Hall herself, she took the katra of Zakal's former student Sotek into her own mind, then joined Spock and the human Dr. Keridwen Llewellyn in pursuing Zakal. When they caught up with Zakal, T'sai was seriously injured in one of Zakal's telepathic attacks, so T'sai transferred Sotek's katra into Llewellyn's mind. Sotek and Llewellyn later sacrificed themselves by setting a self destruct on the ship Zakal had hijacked and kept him from stopping in. Llewellyn died in the explosion, and the katras of both Sotek and Zakal were destroyed. This helped keep the katras out of Romulan hands.
Afterwards Spock decided to undergo the Kolinahr ritual. Almost three years later T'sai felt he was ready to receive the symbol of pure logic, but Spock declined due to contact he had with the V'ger entity. Melding with Spock she learned that this alien presence was touching Spock's human side, and that Spock would not find the answers he sought among the Kolinahru.
