this sutta is about details in all one's internal & external organs, and the inner thoughts, understanding from the liberal aspect but contemplating solely on the literal of the source code. This source code you need to realize it, otherwise all contemplation is gearing into its realization. The actualization thereafter depends on one aptitude and hardwork.
To become vegetarian is to step into the stream which leads to nirvana.
If you light a lamp for somebody, it will also brighten your path. He who experiences the unity of life sees his own Self in all beings, and all beings in his own Self.