Passage
Speake not euill one of another, brethren. He that speaketh euill of his brother, or he that condemneth his brother, speaketh euill of ye Law, and condemneth the Lawe: and if thou condemnest the Lawe, thou art not an obseruer of the Lawe, but a iudge.
Nearby Context
James 4:9 Suffer afflictions, and sorrowe ye, and weepe: let your laughter be turned into mourning, and your ioy into heauinesse.
James 4:10 Cast downe your selues before the Lord, and he will lift you vp.
James 4:11 Speake not euill one of another, brethren. He that speaketh euill of his brother, or he that condemneth his brother, speaketh euill of ye Law, and condemneth the Lawe: and if thou condemnest the Lawe, thou art not an obseruer of the Lawe, but a iudge.
James 4:12 There is one Lawgiuer, which is able to saue, and to destroy. Who art thou that iudgest another man?
James 4:13 Goe to now ye that say, To day or to morowe we will goe into such a citie, and continue there a yeere, and bye and sell, and get gaine,
Study Lenses
The verse centers on "condemn", "speake", "euill", "another", "brethren", "speaketh", "brother", and "condemneth". It is saying that the verse draws attention to "condemn" and "speake", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 10's "Cast downe your selues before the Lord..." into verse 12's "There is one Lawgiuer which is able...", so "condemn" and "speake" belong inside that flow. In James context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "condemn" and "speake" with trust shaped by these words, not by a vague optimism outside the passage.