Christ Himself is the grain of mustard seed, who, planted in the garden of the sepulchre, grew up a great tree; He was a grain of seed when He died, and a tree when He rose again; a grain of seed in the humiliation of the flesh, a tree in the power of His majesty.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Mor., xix, 1