prayogaḥ yadyadā na bhavati na tat tadānīm avikalakāraṇam yathā kuśūlasthitabījāvasthāyām anutpadyamāno 'ṅkuraḥ /
The formal argument is: Whatever does not arise at a particular time does not have an unimpeded cause at that time - like a sprout that does not arise while the seed remains in the granary.