Comprehend Languages (a)

For the duration, you understand the literal meaning of any language that you hear, see, or otherwise perceive. This understanding applies to verbal speech, sign language, written language, carved runes, telepathic communication, and other speech that you are able to fully perceive. To understand written language that you see or feel, you must be touching the surface on which the words are written. It takes about 1 minute to read one page of text.

This spell doesn't decode secret messages in a text or a glyph, such as an arcane sigil, that isn't part of a written language.