ψευδόμενος οὐδεὶς λανθάνει πολὺν χρόνον → nobody lies for a long time without being discovered
opinion: P. and V. δόξα, ἡ.
supposition: P. ὑπόθεσες, ἡ.
theory as opposed to practice: P. γνῶσις, ἡ (Plato, Politicus 259E).
science: P. and V. ἐπιστήμη, ἡ.
