subtlety
From LSJ
φιλεῖ δέ τοι, δαιμόνιε, τῷ κάμνοντι συσπεύδειν θεός → you know, my good fellow, when a man strives hard, a god tends to lend him aid
P. ποικιλία, ἡ, τὸ γλαφυρόν.
delicacy: Ar. and P. λεπτότης, ἡ.
by subtlety, by craft: Ar. and V. δόλῳ; see craft.