الْحُجَّةُ مِيزَانُ الْأَقْوَالِ.
Evidence is the scale by which statements are weighed.
The short sentence presents a criterion. A longer explanation might add: identify a claim, examine its evidence, then form a judgment. Expansion is useful only when the audience needs that procedure made explicit.
Concision is not an absolute word-count competition, nor is elaboration necessarily a flaw. Suitability depends on whether the communication needs only the principle or the steps for applying it.