Aletheia, the tuning practiced by wizards, requires precise meanings. This is why arcane incantations are always spoken in a constructed language, as natural languages are too easily corrupted by the inconstancies of daily use. The precision and otherness of the arcane languages serves to protect the semantics of aletheia from the inconstancies of real lives and thoughts.
Arcane incantations require the tuner to say and think two separate things simultaneously. The spoken segment of an incantation, the utterance, must have its meaning focused with a silent segment, the thought, that is simultaneously thought. The thought incantation sharpens the meaning of the spoken incantation. Preserving and expressing the pure modalities of meaning is the heart of Alethia.