This is no joke
In the question: The matter is a matter of will and not of light value.
(Modern Hebrew)
Translation
Expression (Hebrew)
זֹאת לֹא בְּדִיחָה
Definition (Hebrew)
בְּהַשְׁאָלָה: הַמְּדֻבָּר בְּדָבָר רְצִינִי וְלֹא קַל עֵרֶךְ.
(הָעִבְרִית הַחֲדָשָׁה)