[IDEM libro sexto ad Sabinum. ] §45.1.7.prImpossibilis condicio cum in faciendum concipitur, stipulationibus obstat: aliter atque si talis condicio inseratur stipulationi 'si in caelum non ascenderit': nam utilis et praesens est et pecuniam creditam continet.
[THE SAME, in the sixth book on Sabinus.] When an impossible condition is formulated in terms of doing something, it stands in the way of stipulations; it is otherwise than if such a condition as 'if he does not ascend into heaven' is inserted into a stipulation; for this is valid and unconditional, and contains a loaned sum.