... The needle, when put into the water, it goes down quickly to the bottom. But a big, big log, weighing one ton, does not go down. Who has made this law? If the law of gravity is there, why does it not apply to the big log? We can understand that Lord Ramacandra was able to make a bridge by causing the big stones to float in the water, so counteracting the law of gravitation is the law of the Supreme. Gravitation is caused by the Supreme Lord, so He is also able to remove that law or do anything and everything at His will. If you know something like swimming, then the law of gravitation will not work, and who knows better than Krishna how to do everything, so Krishna can change anything, therefore we worship Him as the greatest Scientist.
Letter to Rupanuga, 3 May, 1972