To be acquainted with

to be possessed of personal knowledge of; to be cognizant of; to be more or less familiar with; to be on terms of social intercourse with.

See also: Acquaint

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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He added that Islamic literature influenced him very much and his friends helped him a lot to be acquainted with it.
In general, it is possible for me to be acquainted with the fact that I am acquainted with some fact.