To begin with, pencils and paper are not going away soon. The freedom and spontaneity of mark-making, the tactile quality of a writing surface and drawing instrument, and the immediacy and convenience of the human touch will forever remain seductive. The sensuality of the hand persists and will survive as a valuable aid to visual communication, as will the need to place your ideas accurately on paper. Furthermore, knowledge is empowering. As a professional, understanding the foundations of drawing, how we process images, and how we interpret what we see are principal skills. This knowledge transfers directly to your drawings, giving them an air of confidence.

— The Complete Guide to Perspective Drawing: From One-Point to Six-Point by Craig Attebery (Page 15)