Picard: "Do you know what business they might have together?"
Sarek: "No! No, I never knew what Spock was doing. When he was a boy he would
disappear for days into the mountains. I would ask him where he had gone,
what he had gone, he refused to tell me. I *insisted* that he tell me. He
would not. I forbade him to go, he ignored me. I punished him, he endured
it. Silently, but always he would turn to the mountains when night arrived."
-- "Unification I", Stardate 45235.4