The Roman History · Amm. 14.11.8

Being therefore in this critical situation, and feeling that he had to expect the worst unless he took vigilant care, he embraced the idea of seizing on the supreme power if he could find any opportunity: but for two reasons he distrusted the good faith of his most intimate councillors; both because they dreaded him as at once cruel and fickle, and also because amid civil dissensions they looked with awe upon the loftier fortune of Constantius.

Ammianus Marcellinus · translated by C. D. Yonge · 1911 reprint
C. D. Yonge translation (preface dated February 1862); G. Bell and Sons, 1911; Project Gutenberg #28587
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