Read it through once

‘An Epistle containing the Strange Medical Experiences of Karshish, the Arab Physician’, is one of Browning’s most remarkable psychological studies. It may be said to polarize the idea, so often presented in his poetry, that doubt is a condition of the vitality of faith. In this poem, the poet has treated a supposed case of a spiritual knowledge “increased beyond the fleshly faculty--heaven opened to a soul while yet on earth, earth forced on a soul’s use while seeing heaven”, a spiritual state, less desirable and far less favorable to the true fulfilment of the purposes of earth-life, than that expressed in the following lines from ‘Easter Day’:--