Shawn Thuris in an excerpt from Act 2, scene 2 of Tristan und Isolde. (Tristan is saying, in essence, that if he willingly dies for the sake of their love, then their love cannot die.)
Tristan agrees to drink the potion, although he expects to die from it. (From Act 1.)
Shawn Thuris in an excerpt from Tristan und Isolde, Act 2 sc 3. Tristan invites Isolde to follow him to “the land of night”.