Einstein:

It never really quite made sense to me either. After all, in reality one hardly notices the effects of these two invisible forces. According to my Theory of General Relativity, on the other hand, the Moon and apple move along their trajectories because our world is constituted in such a way that these are the simplest and most direct for them, even though they are not straight lines. Thus, gravity is not an invisible force but simply the expression of how our world is, with all its irregularities, to which the distribution of solid bodies in our universe also belongs.

Newton:

Was the heresy of Aristotle victorious again in your time, which states that there are places in space of different quality? And I had put physics on an irrefutable footing.

Einstein:

Seekers of scientific truth must be prepared for change. And should not stop asking questions!