Prajā means those who have taken birth, they are called prajā. Ja means birth. Ja. Janma, janma. And prajā, prakṛṣṭa-rūpeṇa ja. Anyone, prajā . . . just like in a state it is called prajā, or citizens, who have taken the birth in that particular place. So similarly, Lord Kṛṣṇa says that "If I do not set example in My life, then there will be unwanted population."
Unwanted population. And actually that has become now in the present world. By not following the principles of God consciousness, or Kṛṣṇa consciousness, we have got now unwanted population. Unwanted population. Here it is plainly written, saṅkarasya ca kartā syām. Saṅkarasya ca means cross-breeding. Saṅkarasya.
According to Vedic rites, the breeding of child is very nicely enunciated. That is called garbhādhāna-saṁskāra. Garbhādhāna-saṁskāra. Before begetting a child, one has to perform some ceremonies just to make his mind completely pure and sanctified. Both the husband and wife become sanctified, and then they take part in sex life, and that child becomes . . . comes out a very nice child. So from the very beginning of the birth there are systems how to beget good population. So these things are there.
Now, Kṛṣṇa says that, "If I do not place the ideal life, then the population will be saṅkara." Saṅkara means unwanted; creating disturbances always. There will be no peace in the world. For actually we are feeling that there is no peace in the world. Why? Because the population has become unwanted.