What would Plato think of modern physics?
Plato lived over 2000 years before before the era of modern physics, and our understanding of science and physics has developed tremendously since that time. Plato was interested not only in the nature of reality, but also how one learns and studies. He would likely be blown away at the progress that has been made in many areas of science, including modern physics. He would probably very much appreciate the scientific method of learning. 

Modern physics, and quantum physics specifically, is bumping up against nearly incomprehensible realities, such as dark energy, black hole singularities, particle-wave dualities, and other effects that surprised and disturbed even great physicists like Albert Einstein. Plato would likely be fascinated to learn of these cutting edge insights, strange experimental results, and apparent contradictions that lie at the very foundations of reality as we know it. Perhaps, as one who often pondered metaphysics, he would see some spiritual or deeper reality at work underneath the mysteries unveiled by modern physics. He may be deeply pleased to find that after all this time, the universe has humbled even the greatest minds, and is in no danger of being fully comprehended or appreciated.
Great! Now, give me 5 quotes from them.
Here are five qoutes from Plato:

- “When the mind is thinking it is talking to itself.” 
- “Be kind, for everyone you meet is fighting a harder battle.”
- “Human behavior flows from three main sources: desire, emotion and knowledge.” 
- “Wise men talk because they have something to say; fools, because they have to say something.” 
- “Every heart sings a song, incomplete, until another heart whispers back. Those who wish to sing always find a song. At the touch of lover, everyone becomes a poet.”