σαφ' οἶδα

From LSJ

ῥίζα γὰρ πάντων τῶν κακῶν ἐστιν ἡ φιλαργυρίαroot of all the evils is the love of money, for every possible kind of evil can be motivated by the love of money

Source

Greek > English (Woodhouse)

I know clearly, I warrant