The force lies in the word φύσει, ‘naturally,’ which the Council expressed still more definitely by ‘essence.’ Thus Cyril says, ‘the term “Son” denotes the essential origin from the Father.’ Dial. 5. p. 573. And Gregory Nyssen, ‘the title “Son” does not simply express the being from another’ vid. infra. §19.), but relationship according to nature. contr. Eunom. ii. p. 91. Again S. Basil says, that Father is ‘a term of relationship,’ οἰκειώσεως. contr. Eunom. ii. 24. init. And hence he remarks, that we too are properly, κυρίως, sons of God, as becoming related to Him through works of the Spirit. ii. 23. So also Cyril, loc. cit. Elsewhere S. Basil defines father ‘one who gives to another the origin of being according to a nature like his own;’ and a son ‘one who possesses the origin of being from another by generation,’ contr. Eun. ii. 22. On the other hand, the Arians at the first denied that ‘by nature there was any Son of God.’ Theod. H. E. i. 3. p. 732.