'Unknown' in the Bible

For [as I] was passing through and observing carefully your objects of worship, I even found an altar on which was inscribed, 'To an unknown God.' Therefore what you worship without knowing [it], this I proclaim to you--

as unknown and [yet] known completely, as dying, and behold, we go on living, as disciplined, and [yet] not put to death,

but I was unknown {in person} to the churches of Judea [that are] in Christ,