I think this is going to be the theme of my next mix. The lyrics are contained in one of the trax I’ll be using (“Ruhe” by Schiller)
Ruhe, das höchste Glück auf Erden, kommt sehr oft nur durch Einsamkeit in das Herz.
Peace, the highest pleasure on earth, very often comes to the heart by loneliness only.
Actually, this translation might be better:
Silence, the greatest happiness on earth, only comes through loneliness at heart.
Or maybe a combination of the two. You work it out.