פירוש על ברכות 66:16

One who says... in his Tefillah.

HE RECITES: "WE GIVE THANKS, WE GIVE THANKS," [THEY] SILENCE HIM. Yerushalmee says that this rule about silencing one who repeats modim has been said is true when this happens in a congregation, but in private they the repetitive modim are supplication and they need not be silenced.

Your mercy reaches the mother bird... [The Mishnah is referring to] men who present themselves as consciencious in deepening their entreaties to God by saying "you are merciful so that you even extend your mercy to the mother bird, as you command to send away the mother bird.

The reference is to Deut. xxii. 6f.

Implying, not for the bad.

Repeating the words ; see below in the Gemara.