deceit
From LSJ
ἔνδον σκάπτε, ἔνδον ἡ πηγή τοῦ ἀγαθοῦ καί ἀεί ἀναβλύειν δυναμένη, ἐάν ἀεί σκάπτῃς → Dig within. Within is the wellspring of Good; and it is always ready to bubble up, if you just dig. | Look within. Within is the fountain of the good, and it will ever bubble up, if thou wilt ever dig.
subs.
P. and V. ἀπάτη, ἡ. στροφή, ἡ, δόλος, ὁ (rare P.), μηχάνημα, τό, σόφισμα, τό, Ar. and P. κλέμμα, τό; see deceitfulness, trick.