The 'all is one, one is all' shirt is a parody of the Three Musketeers that is a reminder, for the wearer and those perceiving, that 📝We Are One.
It is soon to be available for purchase in 📝Spiritual Bro Store.
Background
Unus pro omnibus, omnes pro uno is a Latin phrase that means "One for all, all for one" in English. It is the unofficial motto of Switzerland. The phrase "Un pour tous, tous pour un" was made famous by its use in the novel The Three Musketeers.