This has similarly been attributed to Buchan, but is actually a misrendering of a sentence from the first paragraph of John Bunyan, Discourse on Prayer. Bunyan's original sentence reads: "It is the opener of the heart of God, and a means by which the soul, though empty, is filled."
More quotes by John Buchan
I have heard an atheist defined as a man who had no invisible means of support.
We can pay our debts to the past by putting the future in debt to ourselves.
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Attribution
Quote text and notes from Wikiquote: John Buchan (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.