But to minds strongly marked by the positive and negative qualities that create severity,—strength of will, conscious rectitude of purpose, narrowness of imagination and intellect, great power of self-control, and a disposition to exert control over others,—prejudices come as the natural food of tendencies which can get no sustenance out of that complex, fragmentary, doubt-provoking knowledge which we call truth.
There are no more uses of "sustenance" in the book.
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The soup kitchen was her only sustenance.
As they grew more affluent, gardeners planted more for beauty than for sustenance.