Growth Mindset T-Shirt, We can do hard things July 14, 2021August 6, 2019 by J.S. Inspire kids with this Growth Mindset T-Shirt. Designs on front and back of tee. Intelligence Can Be Developed. We can do hard things. Back to school T-Shirt for teachers and educators. Get Yours.. Teespring Store. See my teacher tees in this post.