The Solid Declaration explains Luther: conversion wholly the work of the Spirit, not without the word
They confirm the same afterwards in the Solid Declaration, a full and clear restatement of certain articles of the Augsburg Confession that had for a time been disputed among some theologians who adhered to it; like the Epitome before it, this is included in the Book of Concord.
'When Luther affirms,' they say, 'that man is purely passive in his conversion, that is, does nothing at all but only undergoes what God works in him, he certainly does not think conversion happens without the preaching and hearing of God's word. Nor did he want this taken as if in conversion the Holy Spirit stirred up no new motions in us at all and began no spiritual working in us.
What Luther meant is that man cannot contribute anything, or bring any help to his conversion, of himself or by his natural powers; and that man's conversion is not partly but entirely the working, gift and work of the Holy Spirit alone.'
Latin
XLI. Quod idem postea confirmant in solida ac perspicua repetitione & declaratione quorundam articulorum Augustanae Confessionis, de quibus aliquandiu inter nonnullos Theologos eidem addictos disputatum fuit, quae ut praecedens Epitome inserta est libro Concordiae. Quando, inquiunt, Lutherus affirmat hominem in conversione sua pure passive se habere, id est, plane nihil agere, sed tantummodo pati id quod Deus in ipso agit, certe non sentit quod conversio absque praedicatione & auditione verbi Dei fiat: neque haec ita accipi voluit, quasi in conversione per Spiritum Sanctum prorsus nulli novi motus in nobis excitentur, neque ulla spiritualis operatio in nobis inchoetur, sed hoc voluit Lutherus, hominem ex seipso aut naturalibus suis viribus non posse aliquid conferre, vel adjumentum adferre ad suam conversionem: & hominis conversionem non tantum ex parte, sed totam prorsus esse operationem, donum, & opus solius Spiritus Sancti.