Why does the echo command do not work with at command?

when I type:

at now + 1 min
at>play /usr/share/sounds/startrek.wav
at>ctrl+d

it works, so after one minute there is actually a sound played.

but, when I type:

at now + 1 min
at>echo "Teresa the green vegetable lover"
at>ctrl+d

I got no error response from the shell, but after 1 minute there is also no text displayed.