The Revised Version puts in the margin as an alternative rendering for
'citizenship' commonwealth, and there appears to be a renewed allusion
here to the fact already noted that Philippi was a 'colony,' and that
its inhabitants were Roman citizens. Paul uses a very emphatic word for
'is' here which it is difficult to reproduce in English, but which
suggests essential reality.
The reason why that heavenly citizenship is ours in no mere play of the
imagination but in most solid substance, is because He is there for whom
we look. Where Christ is, is our Mother-country, our Fatherland,
according to His own promise, 'I go to prepare a place for you.' His
being there draws our thoughts and sets our affections on Heaven.