cf. note on § 15.  So Athan. in Matt. xi. 22.  Σφραγὶς γάρ ἐστιν ἰσότυπος ἐν ἑαυτῷ δεικνὺς τὸν πατέρα.  cf. Athan., De Dec. § 20, and note 9 in this series, p. 163.  cf. also Greg. Nyss., In Eunom. ii. 12.