Do you mean the Keller quote? I don’t necessarily associate it with anything mystic – in fact, my wont is to presume that it was something empirical. The empirical can be denied, of course, or dismissed, but that is a choice, and not childlike. Rich Stearns is a great example whose account I would not consider ‘mystical’, with its multiple objective events. The one thing where the adjective might apply would be Bill Bryce’s ‘prophecy’, but we don’t know the details. There is certainly a wonderful mystery in how God works in providence (you’ve seen that before, too 
), but objective empirical events that can be documented (and denied) I would not label as mystical.
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