"Private prayer is like straw scattered here and there: If you set it on fire it makes a lot of little flames. But gather these straws into a bundle and light them, and you get a mighty fire, rising like a column into the sky; public prayer is like that."

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In 1975, ... [speaking with Shiing Shen Chern], I told him I had finally learned ... the beauty of fiber-bundle theory and the profound Chern-Weil theorem. I said I found it amazing that gauge fields are exactly connections on fiber bundles, which the mathematicians developed without reference to the physical world. I added, "this is both thrilling and puzzling, since you mathematicians dreamed up these concepts out of nowhere." He immediately protested: "No, no. These concepts were not dreamed up. They were natural and real."

— Chen-Ning Yang