Pros (πρός) is a common Greek preposition taking three cases: with accusative (most common in NT — "toward, to, in the presence of, for the purpose of"), with genitive (rare — "from"), and with dative (rare — "at, near"). In the NT it appears about 700 times, overwhelmingly with the accusative, expressing movement or orientation toward a person or thing.
Its fundamental sense is directional: pointing toward something. But it also expresses purpose ("in order to"), relational proximity ("with," "in the presence of"), and correspondence ("fitting for").
The most theologically explosive use of pros is in John 1:1-2: "In the beginning was the Word, and the Word was with [pros] God, and the Word was God. He was in the beginning with [pros] God." The preposition pros here is far richer than a mere locative "beside" — it implies face-to-face relationship, an orientation-toward, a dynamic intimacy between the Son and the Father from eternity.
John's prologue uses pros to establish the eternal personhood and relational life within the Godhead before creation. This is not a static coexistence but a living, oriented, relational communion — the eternal dance of the Trinity. Pros then becomes the preposition of gospel mission: the Word who was toward God comes toward humanity (John 1:11, 14), drawing us into the same relational field from which he came.