Spiritual Gifts and Church Order
Ignatius of Antioch, To Polycarp 2.2
Be shrewd as the serpent in everything, and forever innocent as the dove. That is why you are both fleshly and spiritual: so you can deal gently with what shows before people’s faces, and ask for the unseen to be shown to you — that you may lack nothing and overflow with every gift.
Greek
φρόνιμος γίνου ὡς ὁ ὄφις ἐν ἅπασιν καὶ ἀκέραιος εἰς ἀεὶ ὡς ἡ περιστερά. διὰ τοῦτο σαρκικὸς εἶ καὶ πνευματικός, ἵνα τὰ φαινόμενά σου εἰς πρόσωπον κολακεύῃς· τὰ δὲ ἀόρατα αἴτει ἵνα σοι φανερωθῇ, ὅπως μηδενὸς λείπῃ καὶ παντὸς χαρίσματος περισσεύῃς.