पुरा earlier, बालायाः when you were young, ते your, एतत् this, शीलव्यसनम् perverse behaviour, अहम् I, नाभिजानामि did not know, तु but, इदानीम् now, ते your, तत् about that, लक्षये perceiving, विपरीतवत् reverse of it.

I never knew earlier when you were young that you possessed such perverse behaviour. But now I perceive the reverse (of what I knew).