Sight

Looking at forbidden things leads to sin. The eyes see and the heart desires. ...Even innocent gazing causes sin; it turns your heart to trivialities and confuses your thoughts, making it difficult to concentrate on your prayers. By nature, a person cannot look at anything without thinking about it. ...When you dull the vision of the soul, you erect a barrier between yourself and G-d and become incapable of perceiving higher truths.

(Pele Yoetz)