In necessariis unitas, in dubiis libertas, in omnibus caritas

It is often misattributed to Augustine of Hippo, but seems to have been first used in 1617 by Archbishop of Split (Spalato) Marco Antonio de Dominis in his anti-Papal De Republica Ecclesiastica,[1] where it appears in context as follows (emphasis added): Quod si in ipsa radice, hoc est sede, vel potius solio Romani pontificis haec abominationis lues purgaretur et ex communi ecclesiae consilio consensuque auferretur hic metus, depressa scilicet hac petra scandali ac ad normae canonicae iustitiam complanata, haberemus ecclesiae atrium aequabile levigatum ac pulcherrimis sanctuarii gemmis splendidissimum.

I feel so, I wish so, I hope so plainly, in him who is our hope and we shall not be disappointed.Before the 21st century, academic consensus was that the source of the quotation was probably Lutheran theologian Peter Meiderlin (known as Rupertus Meldenius), who, in his Paraenesis votiva pro pace ecclesiae ad theologos Augustanae of 1626 had said, "Verbo dicam: Si nos servaremus in necessariis Unitatem, in non-necessariis Libertatem, in utrisque Charitatem, optimo certe loco essent res nostrae", meaning "In a word, let me say: if we might keep in necessary things Unity, in non-necessary things Freedom, and in both Charity, our affairs would certainly be in the best condition."

[3] According to Joseph Lecler, the substitution of dubiis for non necessariis (omnibus occurs here, rather than, as in Meiderlin, utrisque) was made in largely Catholic circles, and had the effect of extending "the rule of Meldenius... to much more than just the necessaria [(for salvation)] and the non necessaria [(for salvation)]", much more than just the "fundamental articles": "the tripartite maxim... [thus] lost its original Protestant nuance, in order to extend liberty to the entire domain of questions debated, doubtful, and undefined [(non définies par l'Église)]".

"[6] In the United Methodist Church Book of Discipline, the phrase appears in the doctrinal history section as "In essentials, unity; in non-essentials, liberty; and in all things, charity."

A few lines later, the mandate is emphasized as "the crucial matter in religion is steadfast love for God and neighbor, empowered by the redeeming and sanctifying work of the Holy Spirit.