Sigh. The Mormon doctrine of the 3 degrees of glory is NOT located in Paul's 1st epistle to the Corinthians. As a matter of fact, he doesn't even use the word Telestial (as it didn't even exist until the 19th century). In Paul's epistle when he used the Greek word ἐπουράνιος (epouranios) it simply means "heavenly". And when he used the Greek word ἐπίγειος (epigeios) it simply means "earthly". How on earth (epigeios) could anyone twist 1 Cor. 15:40 to teach the Mormon concept of 3 degrees of glory is beyond me!
It might be beyond you, but it's not beyond me.