[If] a minor received [it], and [then] became of age; [or] a deaf-mute, and he [then] became able to hear; [or] a blind person, and he [then] became able to see; [or] a mentally deranged person, and he [then] became sane; [or] a gentile, and he [then] became a proselyte —- [he is] not valid. However, [if it was] a hearing person [who received it], and he [then] became a deaf-mute, and then regained his hearing; [or] a seeing person, and he [then] became blind, and [then] regained his sight; [or] a sane person, and he [then] became mentally deranged, and [then] regained his sanity —- [he is] valid. This is the general rule: Anyone who is mentally competent at the beginning and at the end is valid.