This double aspect of all possible revelation of God, which was symbolised in comparatively gross external form in the pillar that led Israel on its march, and lay stretched out and quiescent, a guarding covering above the Tabernacle when the weary march was still, recurs all through the history of Old Testament revelation by type and prophecy and ceremony, in which the encompassing cloud was comparatively dense, and the light which pierced it relatively faint. It reappears in both elements in Christ, but combined in new proportions, so as that 'the veil, that is to say, His flesh,' is thinned to transparency and all aglow with the indwelling lustre of manifest Deity. So a light, set in some fair alabaster vase, shines through its translucent walls, bringing out every delicate tint and meandering vein of colour, while itself diffused and softened by the enwrapping medium which it beautifies by passing through its purity. Both are made visible and attractive to dull eyes by the conjunction. 'He that hath seen Christ hath seen the Father,' and he that hath seen the Father in Christ hath seen the man Christ, as none see Him who are blind to the incarnate deity which illuminates the manhood in which it dwells.
But we have to note also the varying appearance of the pillar according to need. There was a double change in the pillar according to the hour, and according as the congregation was on the march or encamped. By day it was a cloud, by night it glowed in the darkness. On the march it moved before them, an upright pillar, as gathered together for energetic movement; when the camp rested it 'returned to the many thousands of Israel' and lay quietly stretched above the Tabernacle like one of the long-drawn, motionless clouds above the setting summer sun, glowing through all its substance with unflashing radiance reflected from unseen light, and 'on all the glory' (shrined in the Holy Place beneath) was 'a defence.'
Both these changes of aspect symbolise for us the reality of the Protean capacity of change according to our ever-varying needs, which for our blessing we may find in that ever-changing, unchanging, divine Presence which will be our companion, if we will.
It was not only by a natural process that, as daylight declined, what had seemed but a column of smoke in the fervid desert sunlight, brightened into a column of fire, blazing amid the clear stars. But we may well believe in an actual admeasurement of the degree of light, correspondent to the darkness and to the need for certitude and cheering sense of God's protection, which the defenceless camp would feel as they lay down to rest.
When the deceitful brightness of earth glistens and dazzles around us, our vision of Him may be 'a cloudy screen to temper the deceitful ray'; and when 'there stoops on our path, in storm and shade, the frequent night,' as earth grows darker, and life becomes greyer and more sombre, and verges to its eventide, the pillar blazes brighter before the weeping eye, and draws nearer to the lonely heart. We have a God who manifests Himself in the pillar of cloud by day, and in flaming fire by night.
II. Note the guidance of the pillar.
When it lifts the camp marches; when it glides down and lies motionless the march is stopped, and the tents are pitched. The main point which is dwelt upon in this description of the God-guided pilgrimage of the wandering people is the absolute uncertainty in which they were kept as to the duration of their encampment, and as to the time and circumstances of their march. Sometimes the cloud tarried upon the Tabernacle many days; sometimes for a night only; sometimes it lifted in the night. 'Whether it was by day or by night that the cloud was taken up, they journeyed. Or whether it were two days, or a month, or a year that the cloud tarried upon the Tabernacle, remaining thereon, the children of Israel abode in their tents, and journeyed not: but when it was taken up they journeyed.' So never, from moment to moment, did they know when the moving cloud might settle, or the resting cloud might soar. Therefore, absolute uncertainty as to the next stage was visibly represented before them by that hovering guide which determined everything, and concerning whose next movement they knew absolutely nothing.