As to rebirth, it must be confessed that no rule holds good for all cases. Some people are reborn almost immediately—it most often happens with parents that a part of them gets assimilated into their children if the latter are very much attached to them. Some people, however, take centuries and even thousands of years to be reincarnated. They wait for the necessary conditions to mature which will provide them with a suitable milieu. If one is yogically conscious he can actually prepare the body of his next birth. Before the body is born he shapes and moulds it, so that it is he who is the true maker of it while the parents of the new child are only the adventitious, purely physical agents.
I must here remark in passing that there is a common misconception about rebirth. People believe that it is they who are reincarnated, yet this is a palpable error, though it is true that parts of their being are amalgamated with others and so act through new bodies. Their whole being is not reborn, because of the simple fact that what they evidently mean by their “self” is not a real individualised entity but their exterior personality, the personality composed of the outward name and form. Hence it is wrong to say that A is reborn as B: A is a personality organically distinct from B and cannot be said to have reincarnated as B. You would be right only if you said that the same line of consciousness uses both A and B as the instruments of its manifestation. For, what does remain constant is the psychic being which is not the outward personality at all, but something deep within, something which is not the exterior name and form.
[The Mother: CWM 3]
About Savitri | B1C3-08 The New Life (pp.28-29)