J. B. Lightfoot on Colossians 2:15

ἐν παρρησίᾳ, θριαμβεύσας αὐτοὺς ἐν αὐτῷ. ἐν παρρησίᾳ] ‘_boldly_’, not ‘_publicly_’. As παρρησία is ‘unreservedness, plainness of speech’ (παν-ρησία, its opposite being ἀρρησία ‘silence’), so while applied still to language, it may be opposed either (1) to ‘fear’, as John vii. 13, Acts iv. 29, or (2) to ‘ambiguity, reserve’, Joh. xi. 14, xvi. 25, 29; but ‘misgiving, apprehension’ in some form or other seems to be always the correlative idea. Hence, when it is transferred from words to actions, it appears always to retain the idea of ‘confidence, boldness’; e.g. 1 Macc. iv. 18 λήψετε τὰ σκ^υλα μετὰ παρῥησίας, _Test. xii. Patr._ Rub. 4 οὐκ εἶχον παρῥησίαν ἀτενίσαι εἰς πρόσωπον Ἰακώβ, Jos. _Ant._ ix. 1O. 4 ὑπ’ αἰσχύνης τε τοῦ συμβεβηκότος δεινοῦ καὶ τοῦ μηκέτ’ αὐτῷ παρῥησίαν εἶναι. The idea of publicity may sometimes be connected with the word as a secondary notion, e.g. in Joh. vii. 4, where ἐν παρρησίᾳ εἶναι ‘to assume a bold attitude’ is opposed to ἐν κρυπτῷ ποιεῖν (comp. xviii. 20); but it does not displace the primary sense.