This is the beginning of a Warhammer 40k quote, specifically one used in the trailer for 40k: Mechanicus. It is - big surprise - a quote from the Mechanicus, which is essentially the human Imperium's cyborg tech support squad. The full quote is as follows:

From the moment I understood the weakness of my flesh, it disgusted me. I craved the strength and certainty of steel. I aspired to the purity of the Blessed Machine. Your kind cling to your flesh, as though it will not decay and fail you. One day the crude biomass you call a temple will wither, and you will beg my kind to save you. But I am already saved, for the Machine is immortal… Even in death I serve the Omnissiah.

It has become a meme in both the 40k and the general transhumanist communities for reasons that are probably obvious.