Plotinos: Complete Works, v. 2 In Chronological Order,...

(It might be objected) that if the souls on high do not reason, they will no longer be reasonable. They remain reasonable, however, because they are well able to penetrate into the essence of something, whenever the occasion demands it. Ratiocination should be considered as follows. If it consist in a disposition that is always derived from Intelligence, in an immanent act, a reflection of this power in souls, these must also reason in the intelligible world; but then they have no further need of language. Likewise, when they inhabit heaven, neither do they need to take recourse to speech, as do the souls here below, as a result of their needs and uncertainties. They act in an orderly manner, and in conformity with nature, without premeditation or deliberation. They know each other by a simple intuition, as even here below we know our like without their talking to us, by a mere glance. On high every body is pure and transparent. Each person there, is, as it were, an eye. Nothing is hidden or simulated. Before you have spoken, your thought is already known. It is probable that speech is used by the guardians and other living inhabitants of the air, for they are living beings.