You fill with awe, or thou fillest with awe; archaic second person singular form of the verb 'awe.'
From awe (Old English ege) + -st (archaic second person singular present ending). This form survives primarily in early modern English texts, Biblical translations, and poetry addressing a single person.
'Awest' is the 'thou' form Shakespeare used when speaking to one person—it's why Biblical pronouns sound so formal, because they were actually more intimate when first written.
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