Part Ia IIaeThe PassionsQuestion 43
The Cause of Fear
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The cause of fear is the threatened loss of what we love, or the impending failure to gain what we desire and love. Hence love is a cause of fear.
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Another cause of fear is a realized want of power to repel impending evil. The realization of power existing in the impending evil is also a cause of fear.
Full Summa Text · I-II, Q. 43
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