We made too many compromises already, too many retreats. They invade our space, and we fall back. They assimilate entire worlds, and we fall back. Not again. The line must be drawn here! This far, no farther! Sir Patrick Stewart as Jean-Luc Picard in Star Trek VIII
Which calls to mind this other memorable performance from the TV series.
Good judgment comes from experience which mostly comes from bad judgment. Jason Statham as Arthur Bishop in The Mechanic