 Heytesbury sets the following conditions which must be obtained for limits to exist: (1) there must be a range in which the capacity can act or be acted upon, and another range in which it cannot act or be acted upon, and not both; (2) each capacity should only be able to take a value in the range on which it is measured from zero and the value which serves as its boundary. Thus, if an active capacity is capable of acting upon a given passive capacity in the range, it must be capable of acting upon any less, and if it is not capable of acting upon a given passive capacity, it is not capable of acting upon any greater. Conversely, if a passive capacity is capable of being acted upon by a certain agent, it must be capable of being acted upon by any agent of greater strength, and if it is not capable of being acted upon by a certain agent, it is not capable of being acted upon by a weaker agent; and (3) infinite capacities like the infinite power of God are excluded from the discussion, since no termination can be assigned for them ([RSS] 1494: fol. 29va–vb).