God is the ‘high and lofty One who inhabits eternity’, declared the prophet Isaiah, but exactly how we are to understand the notion of eternity is not clear. Traditionally, the Christian church has taken it to mean ‘timeless’. But in his classic work on this subject, Oscar Cullmann has contended that the New Testament ‘does not make a philosophical, qualitative distinction between time and eternity. It knows linear time only…’ He maintains, ‘Primitive Christianity knows nothing of a timeless God. The “eternal” God is he who was in the beginning, is now, and will be in all the future, “who is, who was, and who will be” (Rev. 1:4).’ As a result, God's eternity, says Cullmann, must be expressed in terms of endless time.