The relativity principle in connection with the basic Maxwellian equations demands that the mass should be a direct measure of the energy contained in a body; light transfers mass. With radium there should be a noticeable diminution of mass. The idea is amusing and enticing; but whether the Almighty is laughing at it and is leading me up the garden path -- that I cannot know.
It is not the sap within the furrowed bark, nor a wing attached to a claw, But rather a garden forever in bloom and a flock of angels forever in flight.
You would get longer livelier and more frequent letters from me, if it weren't for the Christian religion. How that bell tolling at the end of the garden, dum dum, dum dum, annoys me! Why is Christianity so insistent and so sad?
I tremble with pleasure when I think that on the very day of my leaving prison both the laburnum and the lilac will be blooming in the gardens, and that I shall see the wind stir into restless beauty the swaying gold of the one, and make the other toss the pale purple of its plumes, so that all the air shall be Arabia for me.
If you possess a library and a garden, you have everything you need. (translation from the French) Si vous possedez une bibliotheque et un jardin, vous avez tout ce qu'il vous faut.