Shiva Purana
आगन्तुकत्वे कस्यापि भाव्यं केनापि हेतुना ॥ यो ऽयं हेतुरसावेकस्त्वविचित्रस्वभावतः ॥ ६२ ॥
Should it be extraneous it may happen to anyone through any cause. But this cause is single due to its nature not being variegated.
english translation
Agantukatve kasyApi bhAvyaM kenApi hetunA ॥ yo 'yaM heturasAvekastvavicitrasvabhAvataH ॥ 62 ॥
hk transliteration by Sanscript