Title to property passes when the instrument of conveyance is delivered. This is not necessarily the date of execution. The instrument may have been signed long before the day of delivery but no title is passed until delivery. In the absence of proof to the contrary, however, the law presumes an instrument to have been delivered on the day it is executed. To make a legal delivery, the grantor must have been legally competent not only at the time of execution but also of delivery; that is he must have been of legal age and of sufficient understanding to make a contract. The delivery must be voluntary and intentional. An owner having executed a deed of his property might retain it forever and no title would pass. If the deed were stolen from him the thief would obtain no rights under it. A deed recorded after the grantor's death is always open to question, upon the suspicion that it may not have been delivered by the grantor.