How I Met Your Mother 8.01

Klaus : "‘Lebenslanger Schicksalsschatz’ is not something that develops over time. It is something that happens instantaneously. It courses through you like the water of a river after a storm, filling you and emptying you all at once. You feel it throughout your body, in your hands, in your heart, in your stomach, in your skin… have you ever felt this way about someone ?"
Ted : "…I think so."
Klaus : "If you have to think about it, you have not felt it."