14:2a For he who speaks in a tongue does not speak to men, but to God.

This is because a person who speaks in an unknown tongue does not address people, but addresses God.
-or-
Those who speak in unknown/miraculous languages speak to God, not to people.

14:2b Indeed, no one understands him;

For no one understands him,
-or-
Truly, nobody knows what they are saying,

14:2c he utters mysteries in the Spirit.

but he speaks mysteries by the ⌊Holy⌋ Spirit.
-or-
but by the Spirit ⌊of God⌋ they speak hidden words.

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