首楞嚴義疏注經 10.307

10.307

正指是想也。攬父母遺體而成此身，遺體即是想愛流出，故云父母想生。汝之託陰亦是想愛而來，以想遺體為勝境故。識即趣彼，結成胎藏，故云汝心非想不來傳命。斯則三處妄想和合結成此體也。

This directly points out that it is imagination. Taking the parents' bodily remains to form this body, those bodily remains are the outflow of thought and love; hence it says 'produced through the thoughts of your parents.' Your entering the womb also comes from thought and love, because you imagine the bodily remains as an excellent realm. Consciousness then heads toward them and congeals into an embryo; hence it says 'if your mind were not imagining, you would not come and transmit life.' Thus the combination of false imaginations in three places congeals into this body.