en_tn_condensed/luk/02/35.md

a sword will pierce your own soul

This metaphor describes the deep sadness that Mary would feel. Alternate translation: "your sadness will be painful as though a sword pierced your soul" (See: rc://en/ta/man/translate/figs-metaphor)

the thoughts of many hearts may be revealed

Here "hearts" is a metonym for people's inner beings. This can be stated in active form. Alternate translation: "he may reveal the thoughts of many people" or "he may reveal what many people secretly think" (See: rc://en/ta/man/translate/figs-metonymy and rc://en/ta/man/translate/figs-activepassive)