首楞嚴義疏注經 1.197

1.197

下文有十二類，今舉大數。凡夫造業不同，感果差別，名為異生。一切世間者，舉依顯正也。前舉凡心在內，後指佛眼在面，欲取例己亦復然也。

A later passage lists twelve classes; here he cites a round number. Because ordinary beings create different karmas and experience differentiated results, they are called 'different births' (heterogeneous beings). 'All the world' brings up the dependent [environment] to reveal the primary [sentient beings]. First he cites the ordinary mind being inside, and then points to the Buddha's eyes being on the face, wishing to take these as examples that he himself is also like this.