Musar for Niddah 45:27
וכי תימא
be unclean on account of the birth since its eye-ball is round like that of a human eye? And should you suggest that the law is so indeed [it could be retorted]: Why then was not the serpent mentioned?<span class="x" onmousemove="('comment',' In our Mishnah, among the shapes of creatures that cause the woman's uncleanness. ');"><sup>23</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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