sible to be," and "it is not possible to be," are never true of the same thing at the same time, for they are opposed, neither at least are, "it is possible not to be," and "it is not possible not to be," ever true at the same time of the same thing. Likewise of, "it is necessary to be," the negation is not, "it is necessary not to be," but this, "it is not necessary to be," and of, "it is necessary not to be," (the negation) is this, "it is not necessary not to be." Again, of, "it is impossible to be," the negation is not "it is impossible not to be," but "it is not impossible to be," and of, "it is impossible not to be," (the negation) is, "it is not impossible not to be." In fact, universally, as we have said, "to be" and "not to be," we must necessarily regard as subjects, but those things which produce affirmation and negation we must connect with "to be" and "not to be:" we ought also to consider these as opposite affirmations and negations; possible, impossible, contingent, non-contingent, impossible, not impossible, necessary, not necessary, true, not true.
Chapter 13
The consequences are rightly placed thus: "it happens to be," follows, "it is possible to be," and this reciprocates with that; also, "it is not impossible to be" and "it is not necessary to be." But, "it is not necessary not to be," and, "it is not impossible not to be;" follow, "it is possible not to be," and, "it may happen not to be;" and, "it is necessary not to be," and, "it is impossible to be," follow, "it is not possible to be," and, "it does not happen to be;" but, "it is necessary to be," and also, "it is impossible not to be," follow, "it is not possible not to be," and, "it is not contingent not to be:" what we say however may be seen from the following description:
| 1 | 3 |
| It is possible to be | It is not possible to be |
| It may happen to be | - |
