That's very interesting. Now maybe you can respond to the comment that you quoted. The bold part is the key. People don't not eat sponges because they're an animal. They don't eat them because they can't possibly taste good, and I can't imagine they have any nutritional value.
I've seen you say that killing plants and eating them is acceptable because the karmic repercussions are manageable. So, basically, it's OK because it's not quite as bad as killing and eating an animal. It's not actually acceptable, it's just better than that particular alternative.
Correct.
In a sense, killing plants and eating them isn't acceptable, but there is much less suffering involved, and the plants may even benefit. Plants are typically not intelligent/sentient beings. Animals however are. Pigs are quite intelligent, more intelligent than three year olds, and much smarter than dogs. They are social creatures and exhibit tendencies of affection and love. They feel pain. The same type of pain that you and I feel. Plants do not share these same characteristics. Plants have been proven to respond to affection, but they do not experience the level of suffering that animals do.
So, eating plants does incur a some karmic hinderance, but it is very minimal, and therefore manageable by practicing the Quan Yin method, and a much better alternative. Also, more importantly, it's required to be initiated into the Quan Yin method of meditation.
But if you can't be vegetarian completely, you can try another version of the method if you are willing to be vegetarian for 10 days of each month. This method is aptly named the Convenient method, and takes only 30 minutes a day.
Again, I'll quote the master on this subject:
Q. Eating animals is killing living beings, but isn't eating vegetables a kind of killing, too?
M. Eating plants is also killing living things and will create some karmic hindrance, but the effect is very minimal. If one practices the Quan Yin Method for two and a half hours every day, one can get rid of this karmic effect. As we have to eat in order to survive, we choose food which has the least consciousness and suffers the least. Plants consist of 90% water, thus their level of consciousness is so low that it hardly feels any suffering. Furthermore, when we eat many vegetables we don't cut their roots, but rather we help their asexual reproduction by cutting branches and leaves. The end result can actually be beneficial to the plant. Therefore, horticulturists say that pruning vegetation helps them grow large and beautiful.
This is even more evident with fruit. When fruit ripens, it will attract people to eat it by its fragrant smell, beautiful color and delicious taste. It is in this way that fruit trees can achieve their purpose of propagating their seed over a wide area. If we do not pick and eat them, the fruit will become overripe and will fall to the ground to rot. Its seed will be shaded from sunlight by the tree above them and will die. So, eating vegetables and fruit is a natural tendency, which brings to them no suffering at all.