Tamas is complex thing. Tamas has to break at the ultimate. And tamas will prevail beyond the ultimate. Both statements are right and good.

చీకటి నుండి మనిషి వెలుగులోకి వఛ్చి మనిషిగా నిలిచాక తిరిగి చీకటిలో కలిసిపోవాల్సిందే . 

Darkness is character.

And darkness is forever.

BUT human being by becoming has to march from darkness(tamas)(ignorance) and stay in light(knowledge).

DARKNESS IS GOD WHICH MAKES HUMAN(asker) TO BECOME HUMAN(self-earner) AGAIN. 

Peace be upon him.