Mahaditthisutta 1.13

1.13

paripakkaṃ vā kammaṃ phussa phussa byantīkarissāmīti hevaṃ natthi doṇamite sukhadukkhe pariyantakate saṃsāre, natthi hāyanavaḍḍhane, natthi ukkaṃsāvakaṃse.

Pleasure and pain are allotted. Transmigration lasts only for a limited period, so there’s no increase or decrease, no getting better or worse.