Translation:

8. Their intention is to extinguish Allah's Light (by blowing) with their mouths: but Allah will complete (the revelation of) His Light even though the Unbelievers may detest (it).

Notes (Tafseer)

5441. Allah's Light is unquenchable. A foolish, ignorant person who thinks of extinguishing it is like a rustic who wants to blow out electric light as he might blow out a rush candle! "With their mouths" also implies the babble and cackle of Ignorance against Allah's Truth. The more the foolish ones try to quench Allah's Light, the clearer it shines, to shame them!