20.131 (tr. A.T. Murray, rev. William F. Wyatt):
Dangerous are the gods when they appear in manifest form.
χαλεποὶ δὲ θεοὶ ϕαίνεσθαι ἐναϱγεῖς.
Leaf and Bayfield ad loc.:
'are terrible when they show themselves openly': lit. are hard (to face or endure) for (with regard to) appearing visible.
5.101-102 (tr. A.W. Mair):
Whosoever shall behold any of the immortals, when the god himself chooses not, at a heavy price shall he behold.
ὅς κε τιν᾿ ἀθανάτων, ὅκα μὴ θεὸς αὐτὸς ἕληται,
ἀθρήσῃ, μισθῷ τοῦτον ἰδεῖν μεγάλῳ.