"It is something that you are aware of, although not to the same extent that he suffers," Moiraine tells her. "Likewise, the connection goes both ways. If you are dizzy, for example, or incapacitated... it has something of an effect."

A pause, as she considers her words, and then,

"The one leads to the other. What you may channel is inborn, of course, but how strong you are-- how much you can stand, how tired you are, things of that nature -- this has an effect on how long you may continue to weave. Do you understand?"