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==Writings==

The principal theological writings of Basil are his ''Treatise on the Holy Spirit'' (Lat. ''De Spiritu Sancto''), a lucid and edifying appeal to Scripture and early Christian tradition to prove the divinity of the Holy Spirit, and his ''Refutation of the Apology of the Impious Eunomius'', written in 363 or 364, three books against Eunomius of Cyzicus, the chief exponent of Anomoian Arianism. The first three books of the ''Refutation'' are his work; the fourth and fifth books that are usually included to do not belong to Basil, or to Apollinaris of Laodicea, but probably to Didymus The Blind.