Sarvadarshanasangraha 2.37

2.37

na cāyam asiddho hetuḥ/ sthāyini kālabhedena sāmarthyāsāmarthyayoḥ prasaṅgatadviparyayasiddhatvāt/ tatrāsāmarthyasādhakau prasaṅgatadviparyayau prāg uktau/ sāmarthyasādhakāv abhidhīyete/

That to which contrary determinations are attributed is diverse, as heat and cold; but this thing is determined by contrary attributions. Such is the argumentation applied to the cloud (to prove that it has not a permanent but a fluxional existence). Nor is the middle term disallowable, for possession and privation of power and impotence are allowed in regard to the permanent (which you assert) at different times. The concomitance and non-concomitance already described (viz., That which can at any time do anything does not fail to do that at that time, and What at any time does not do anything, that at that time is unable to do it) are affirmed (by us) to prove the existence of such power. The negative rule is: What at any time is unable to produce anything, that at that time does not produce it, as a piece of stone, for example, does not produce a germ; and this entity (the seed, or whatever it may be), while exerting a present practical efficiency, is incapable of past and future practical efficiencies. The contradiction violating this rule is: What at any time does anything, that at that time is able to do that thing, as a complement of causes is able to produce its effect; and this (permanent) entity exerts at time past and time future the practical efficiencies proper to those times.