en_tn_condensed/rev/13/18.md

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This calls for wisdom

"Wisdom is needed" or "You need to be wise about this"

If anyone has insight

"If anyone is able to understand things"

let him calculate the number of the beast

"he should discern what the number of the beast means" or "he should figure out what the number of the beast means"

is the number of a human being

Possible meanings are 1) the number represents one person or 2) the number represents all of humanity.