In regards to the rule of faith, "Sola Ecclesia = Church Alone" as "Sola Scriptura = Scripture Alone".
From the Catholic Encyclopedia under the heading “THE CHURCH AS THE RULE OF FAITH”:
This follows necessarily from any adequate view of the Church as a Divinely constituted body, to whose keeping is entrusted the deposit of faith, but the grounds for this doctrine may be briefly stated as follows…If faith is necessary for all men at all times and in all places, and if a true saving faith demands a clear knowledge of what we have to believe, it is clear that an infallible teaching Church is an absolute necessity. Such a Church alone can speak to men of all classes and at all times; it alone can, by reason of its perpetuity and ageless character, meet every new difficulty by a declaration of the sound form of doctrine which is to be held. If the teaching of Christ and His Apostles is distorted, none but the Church can say "This is its true meaning, and not that; I know that it is as I say because the Spirit which assists me is One with the Spirit which rested on Him and on them"; the Church alone can say, "Christ truly rose from the tomb, and I know it, because I was there, and saw the stone rolled back". The Church alone can tell us how we are to interpret the words "This is My Body", for she alone can say, He Who spoke those words speaks through me, He promised to be with me all days, He pledged Himself to safeguard me from error at all times".