...and the abyss will gaze back into you.

"Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you."
- Friedrich Nietzsche

Btw, the moth in the picture is an acherontia atropos (Death's Head Hawkmoth), native to southern Europe, the Mediterranean, northern Africa, and Asia, and is notable because of the marking on its back, which is reminiscent of human skull. The actual skull in the image belonged to some Scandinavian viking that passed away some 1000 years ago....
Exif data is for the eye pic.