SB 12.3.24

kalau tu dharma-pādānāṁ
 turyāṁśo ’dharma-hetubhiḥ
edhamānaiḥ kṣīyamāṇo
 hy ante so ’pi vinaṅkṣyati
Synonyms: 
kalau — in the Age of Kali; tu — and; dharma-pādānām — of the legs of religion; turya-aṁśaḥ — one fourth; adharma — of irreligion; hetubhiḥ — by the principles; edhamānaiḥ — which are increasing; kṣīyamāṇaḥ — decreasing; hi — indeed; ante — in the end; saḥ — that one quarter; api — also; vinaṅkṣyati — will be destroyed.
Translation: 
In the Age of Kali only one fourth of the religious principles remains. That last remnant will continuously be decreased by the ever-increasing principles of irreligion and will finally be destroyed.