The human form of body is very good machine. Nṛ-deham ādyaṁ sulabhaṁ sukalpam. It is very rare. With great difficulty you have got this machine, because we have to come through so many machines—the aquatics, the plants, the insects, the trees, and the serpents, reptiles, then birds, then beast—millions and millions of years. Just like you have seen this. The trees are standing there, maybe standing for five thousand years. So if you get that machine, you cannot move, you have to stand in one place. So we had to go through this. Foolish people, they do not know.
Therefore this machine is sulabham. Sulabham means very fortunately we have got this machine. And sukalpam, "very nicely made." Those who are medical man, they see how nicely made it is, how the nerves are working, the nails are working, the intestines and the heart and everything—a grand machine. Therefore it is called sukalpam, "very well planned." And what for? Just like a nice boat, well planned. If you have got a nice boat, you get on it and cross over the river or the ocean. Similarly, we are in this material ocean. Life after life we are struggling. So now we have got a nice boat, this human body. Sulabhaṁ sudurlabham. And it is specially advantageous because the breeze is very favorable. When you ply your boat, if the breeze is favorable, pushing on, that is another advantage, good boat and good breeze. And guru-karṇadhāram (SB 11.20.17): "And the captain, steering man, is guru." He is giving instruction, "Row like this. Turn this way, that way." He is turning everything. So we have got this opportunity. If the boat is very nice, the captain is very nice, the breeze is very favorable, and even accepting or getting this nice boat, favorable, if we do not cross over the sea of ignorance, of material existence, then we are committing suicide, sa ātma-hā (SB 11.20.17). You get all the opportunities, and still you remain in this material world, repetition of birth, death, old age and disease. Is that very good intelligence? No. That is not good.