Agnes Martin, “Agnes Martin: the Artist Mystic who Disappeared into the Desert” by Olivia Laing, The Guardian 22 May 2015

“I paint with my back to the world,” she declared, and what she wanted to catch in her rigorous nets was not material existence, the Earth and its myriad forms, but rather the abstract glories of being: joy, beauty, innocence; happiness itself. (…) Forget confessional art. This is withholding art, evading disclosure, declining to give itself away.