Sāṃkhya Kārikā verse 52

na vinā bhāvaiḥ liṅgaṃ na vinā liṅgena bhāva nirvṛttiḥ |
liṅgena bhāvākhyaḥ tasmāt dvedhā pravartate sargaḥ ||

vinā - withoutbhāva - becomingliṅga - manifest, sign, gendernivṛtti - cessationtasmāt - from that, on that account, thereforepravarta - engaging in, undertaking