This justification of natural love as fullness of joy and life is the deepest thought in Donne's love-poems, far deeper and sincerer than the Platonic conceptions of the affinity and identity of souls with which he plays in some of the verses addressed to Mrs. Herbert. The nearest approach that he makes to anything like a reasoned statement of the thought latent rather than expressed in The Anniversarie is in The Extasie, a poem which, like the Nocturnall, only Donne could have written. Here with the same intensity of feeling, and in the same abstract, dialectical, erudite strain he emphasizes the interdependence of soul and body:
As our blood labours to beget
Spirits, as like soules as it can,
Because such fingers need to knit
That subtile knot, which makes us man:
So must pure lovers soules descend
T'affections, and to faculties,
Which sense may reach and apprehend,
Else a great Prince in prison lies.
It may be that Donne has not entirely succeeded in what he here attempts. There hangs about the poem just a suspicion of the conventional and unreal Platonism of the seventeenth century. In attempting to state and vindicate the relation of soul and body he falls perhaps inevitably into the appearance, at any rate, of the dualism which he is trying to transcend. He places them over against each other as separate entities and the lower bulks unduly. In love, says Pascal, the body disappears from sight in the intellectual and spiritual passion which it has kindled. That is what happens in The Anniversarie, not altogether in The Extasie. Yet no poem makes one realize more fully what Jonson meant by calling Donne 'the first poet in the world for some things'. 'I should never find any fault with metaphysical poems,' is Coleridge's judgement, 'if they were all like this or but half as excellent.'