The idea of a deeper level of understanding, made available only to initiates, is most evident in contexts where the word olbios refers to the bliss of initiation into mysteries of immortalization in general, as we see from the use of this word with reference to the Eleusinian Mysteries:
Blessed [olbios] is he among earthbound mortals who has seen these things.
Homeric Hymn to Demeter 480
Here is another example, found in a song of lament (thrēnos) composed by Pindar:
Blessed [olbios] is he who has already seen those things when he goes below the earth.
Pindar Fragment 137
ὄλβιος ὅστις ἰδὼν κεῖν’ εἶσ’ ὑπὸ χθόν’… .