to examine one's conscience, thinking of one's sins (see Molina)
Alonso de Molina:
tlacentlalilia. nino. (pret. oninotlacentlalili.) examinarse pensando sus pecados. &c. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 116v. col. 2. Thanks to Joe Campbell for providing the transcription.