Words alone, if they be of the time to come, and contain a bare promise, are an insufficient sign of a free gift, and therefore not obligatory. For if they be of the time to come, as “tomorrow I will give,” they are a sign I have not given yet, and consequently that my right is not transferred, but remaineth till I transfer it by some other act. But if the words be of the time present, or past, as, “I have given,” or, “do give to be delivered tomorrow,” then is my tomorrow’s right given away today; and that by the virtue of the words, though there were no other argument of my will. And there is a great difference in the signification of these words, volo hoc tuum esse cras , and cras dabo