Yōga Sūtra 4.04

निर्माणचित्तान्यस्मितामात्रात्।

nirmāṇacittānyasmitāmātrāt।

[निर्माण चित्तानि अस्मिता मात्रात्।
nirmāṇa = are built; cittāni = the chitta; asmitā = from ego; mātrāt = only;]

The Chittas are built from ego only.