" Do you know where the past and the present intersect?" Jac asked him.
"Where?"
"In your mind, only. It's the only point. Otherwise, the past is further away than the furthest galaxy. We know it, intuitively, because we understand the irrevocability of past action, and sometimes that makes us sad." He looked into Gordius's face, trying to read his expression, but the fellow wouldn't make eye-contact with him. "But it ought not to make us sad. Another name for that irrevocable gap between past and present is -- freedom. "

― Adam Roberts , Jack Glass