The X-Files, Season 2

Scully:
[voiceover] Transfusions and a treatment with antiviral agents have resulted in a steady but gradual improvement in Agent Mulder's condition. Blood tests have confirmed his exposure to the still-unidentified retrovirus, whose origin remains a mystery. The search team that found Agent Mulder has located neither the missing submarine nor the man he was looking for. Several aspects of this case remain unexplained, suggesting the possibility of paranormal phenomena. But I am convinced that to accept such conclusions is to abandon all hope of understanding the scientific events behind them. Many of the things I have seen have challenged my faith and my belief in an ordered universe, but this uncertainty has only strengthened my need to know, to understand, to apply reason to those things that seem to defy it. It was science that isolated the retrovirus Agent Mulder was exposed to, and science that allowed us to understand its behavior. And ultimately, it was science that saved Agent Mulder's life.