What is meant by the phrase "accompanied by a condition or an approximation" in the ruling concerning permissible and impermissible hyperbole?

Permissible hyperbole in praise is that which is qualified by a condition or approximation, such as saying "if it is so-and-so" or "approximately." The proof for this is the saying of the Prophet, peace and blessings be upon him: "If one of you must praise, then let him say: 'I reckon him to be such and such,' if he truly believes him to be so, and Allah is his reckoner, and let him not sanctify anyone before Allah."