Man will discover this in centuries to come.

2 seconds sound clip from the The Sword in the Stone (1963) movie soundboard.

You can hear this line at 00:54:15.225 in the Blu-ray version of the movie.

Quote context

[...]

- Now, first of all, lad, we've got to get all of these medieval ideas out of your head. Clear the way for new ideas.

- Knowledge of man's fabulous discoveries in the centuries ahead.

- Now, that will be a great advantage.

- Advantage, indeed!

- If the boy goes about saying the world is round, they'll take him for a lunatic.

- The world is round?

- Yes, yes, that's right.

- And it also goes around.

- You mean, it'll be round someday?

- No, no, no. It's round now.

- Man will discover this in centuries to come.

- And he will also find that the world is merely a tiny speck in the universe.

- Universe?

- Ah. You're only confusing the boy. Before you're through, he'll be so mixed up, he'll be wearing his shoes on his head.

- Man has always learned from the past. After all, you can't learn history in reverse. It's confusing enough, for heaven's sakes.

- All right. All right. Have it your way, Archimedes. You're in charge. You're the headmaster now. So, from now on he's your pupil.

[...]