In answer to this question I want to propose that to is in fact always contentful—that it is never mere Case marking, strictly speaking—but that in certain contexts (namely, in V's headed by Dative-Shifting verbs) its grammatical contribution effectively "reduces" to Case marking and therefore can be suppressed under Passive.
Source: wiktionary
Indeed, it seems to me that the special character of non-conceptually contentful perceptual states entails that all perceptual states contain non-conceptual content in this essentially distinct sense[…].
Source: wiktionary
Can one have contentful but non-conceptual thought? My guess is that we can and I take it that my guess is buttressed by our ordinary practice of talking about the behaviour of animals and pre-linguistic children.
Source: wiktionary
How contentful the whole life is of him, that neither deviseth mischief against others, nor suspects any to be contrived against himself.
Source: wiktionary
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