“26. There is good and sound reason for placing the burden of proof upon the person concerned who asserts to be a citizen of a particular country. In order to establish one's citizenship, normally he may be required to give evidence of (i) his date of birth (ii) place of birth (iii) name of his parents (iv) their place of birth and citizenship. Sometimes the place of birth of his grandparents may also be relevant like under Section 6-A(1)(d) of the Citizenship Act. All these facts would necessarily be within the personal knowledge of the person concerned and not of the authorities of the State. After he has given evidence on these points, the State authorities can verify the facts and can then lead evidence in rebuttal, if necessary. If the State authorities dispute the claim of citizenship by a person and assert that he is a foreigner, it will not only be difficult but almost impossible for them to first lead evidence on the aforesaid points. This is in accordance with the underlying policy of Section 106 of the Evidence Act which says that when any fact is especially within the knowledge of any person, the burden of proving that fact is upon him.”