The phrase "say to oneself" can be used in many different contexts, but there are a variety of synonyms that can be used to convey the same meaning. One common alternative is "think to oneself," which implies an internal dialogue or reflection. Other synonyms include "mutter to oneself," "whisper to oneself," "recite to oneself," and "chant to oneself," all of which suggest different levels of vocalization. "Reflect to oneself," "contemplate to oneself," and "ponder to oneself" are more introspective and thoughtful phrases. Ultimately, the right synonym for "say to oneself" depends on the specific context and tone of the sentence, and there are many options to choose from.