Tell your student(s) that that is exactly the points of Art - to think,
to create from the stress, and to cause others to think.
Perhaps pursue the point with your students (I would trust that he is
not the only one, and a discussion would give them all a chance to
(think) and express their thoughts.
Why does thinking cause stress?
What does stress have to do with art?
in one of my talks with them one student said 'i don't like to make
things(as we have options of sculpture,carpentary,ceramics etc along
with arts) becuase i have to think which is stressful"
can i get help in solving this laziness in the students.