"In essentials, unity. In non-essentials, liberty. In all things, love" ~Rupertus Meldenius, (circa 1627).
A pseudo-truism. Another axiom of ecumenism, frequently tossed out in an effort (no doubt) to "justify" everyone and achieve "balance". A false balance is abomination to the LORD Prov. 11:1.
This slogan is familiar to many, although there is some debate about authorship. Augustine was a great "promoter" of it. Such slogans can be misleading and should be avoided. ESPECIALLY when used to divide Christians, for such is what it does. This statement has misled many in the past and is still doing it today. The only part Rupertus got right is "In all things, love."