The ocean gradually slants, slopes, and inclines, with no abrupt precipice. In the same way in this teaching and training the penetration to enlightenment comes from gradual training, progress, and practice, not abruptly. This is the first thing the mendicants love about this teaching and training. …

Many great beings live in the ocean, such as leviathans, leviathan-gulpers, leviathan-gulper-gulpers, titans, dragons, and centaurs. In the ocean there are life-forms a hundred leagues long, or even two hundred, three hundred, four hundred, or five hundred leagues long. In the same way, great beings live in this teaching and training, and these are those beings. The stream-enterer and the one practicing to realize the fruit of stream-entry. The once-returner and the one practicing to realize the fruit of once-return. The non-returner and the one practicing to realize the fruit of non-return. The perfected one, and the one practicing for perfection. This is the eighth thing the mendicants love about this teaching and training.

Seeing these eight incredible and amazing things, the mendicants love this teaching and training.”

Numbered Discourses 8.21 3. Householders With Ugga of Vesālī