Musar for Niddah 45:1
וילפינן מופנה משני צדדין
and make the deduction from the latter. And it is for this reason<span class="x" onmousemove="('comment',' According to the Rabbis. ');"><sup>1</sup></span>
Orchot Tzadikim
And a man should not rejoice to the point of hilarity for now all joy should be mixed with sobriety, for when our "Holy Rabbi" (Rabbi Judah the Prince) used to laugh thus, troubles came to the world (Berakoth 31a). And similarly "Rabbi Jeremiah would bring Rabbi Zera to the point of laughter, but Rabbi Zera did not laugh" (Niddah 23a).
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