The jury system has come to stand for all we mean by English justice, because so long as a case has to be scrutinised by twelve honest men, defendant and plaintiff alike have a safeguard from arbitrary perversion of the law.
Churchill presents the jury system as an important safeguard against the arbitrary or improper use of legal power. His emphasis is on independent scrutiny: when ordinary citizens examine the evidence and reach a verdict, neither side in a case is wholly dependent on the judgement of a single official or authority. The jury therefore serves, in his account, as a practical protection for fairness within the courts.
The quotation also connects jury trial with a wider conception of English legal tradition and the rule of law. Churchill’s description is idealised, since juries are not immune from error or prejudice, and their role varies between civil and criminal proceedings. Nevertheless, his central argument is that distributing judicial responsibility can limit arbitrary decision-making. More broadly, the passage illustrates how legal institutions can protect individuals by placing procedural checks between state power and the final determination of a case.