According to 1 Timothy 3:16, what is great 'by common confession'?

Answer: The mystery of godliness

The mystery of godliness is great: He appeared in the flesh, was vindicated by the Spirit, was seen by angels... was taken up in glory.

“By common confession, the mystery of godliness is great: He appeared in the flesh, was vindicated by the Spirit, was seen by angels, was proclaimed among the nations, was believed in throughout the world, was taken up in glory.”— 1 Timothy 3:16 (BSB)