διαλογίζεσθαι

From LSJ

ἃ γὰρ δεῖ μαθόντας ποιεῖν, ταῦτα ποιοῦντες μανθάνομεν → what we have to learn to do we learn by doing

Source

Greek > English (Woodhouse Verbs Reversed)

(see also διαλογίζομαι): calculate, balance accounts