We must not see what we should not see.

We must avoid looking at what we should not see (Ref.: 2 Samuel 11:2).

We should not be led by the lust of the eyes (Ref.: 1 John 2:16).

We must make a covenant with our eyes not to gaze lustfully at women (Ref.: Job 31:1).

This is because human eyes are never satisfied (Proverbs 27:20)

and are filled with lust, leading to continuous sin (2 Peter 2:14).

As Pastor Lloyd-Jones said:

"The problem is your eyes.  When you look at something, your heart follows. ...

If there is something that tempts you, do not look at it! ...

 Do not let your eyes covet certain things. Stay focused straight ahead. ...

Make a covenant with your eyes to look straight ahead.

Follow only what God directs, focusing on holiness and heaven"

(Lloyd-Jones, "Darkness and Light").