Time Travel Contents

If John gave a speech to Reese in 2029, who gave it to Sarah and conceived John in 1984, and then Sarah told it to John, then who wrote the bloody speech?

According to classical physics, we have a classic paradox. No one wrote it, everybody just memorized it. Assuming a multiverse, on the other hand, we can posit that a future John Connor (whose mother encountered a Reese who perhaps forgot the speech) *did* write the speech, and gave it to Reese. Reese traveled back to 1984 in *another* universe, and gave it to Sarah (which we saw in T1).