“Don’t say or do anything ignoble even when you are alone—learn how to feel shame in your own presence more than others’.”
φαῦλον, κἂν μόνος ἦις, μήτε λέξηις μήτ᾿ ἐργάσηι. μάθε δὲ πολὺ μᾶλλον τῶν ἄλλων σεαυτὸν αἰσχύνεσθαι.
Democritus, Ethical Fragments B244 (F97b)