In the words of an American actor who died in a car accident before his twenty-fifth birthday, “Dream as if you’ll live forever; live as if you’ll die today.”
 שומע כעונה is applicable to some mitzvos and blessings that must be verbalized. One can fulfill his obligation by hearing another person’s recitation if both he and the one reciting have in mind to help the listener fulfill his obligation through the declaration. This law applies most notably to Kiddush and Megillah reading.
 See Biur Halacha (489:1)