Half-Life (1998)
"The right man in the wrong place can make all the difference in the world." – G-Man

Half-Life: Opposing Force (1999)
"We all have to make choices, Corporal. In your position, I would have done the same thing." – G-Man

Half-Life: Blue Shift (2001)
"Sometimes the quiet ones make the biggest difference." – Unnamed Security Guard

Half-Life 2 (2004)
"The right man in the wrong place can make all the difference in the world." – G-Man

Half-Life 2: Episode One (2006)
"We’ve got to move fast. The world won’t wait." – Alyx Vance

Half-Life 2: Episode Two (2007)
"Sometimes we don’t see the whole picture, but we keep moving forward." – Eli Vance

Half-Life: Alyx (2020)
"This is bad. But we’ll figure it out. We always do." – Russell