en_tn_condensed/rev/13/18.md

General Information:

This verse is a break from John's account of his vision. Here he gives another warning to the people reading his account.

This calls for wisdom

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

If anyone has insight

The word "insight" can be translated with the verb "understand." Alternate translation: "If anyone is able to understand things" (See: rc://en/ta/man/translate/figs-abstractnouns)

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.