This article revisits the present and future of the direct effect principle and submits solutions for its appropriate understanding and enforcement. Once the topic has been put into context and it has been shown why direct effect is an evolving notion whose scope goes beyond the Van Gend & Loos judgement and the doctrine originating from it, the study presents five intertwined arguments. First, direct effect has two facets since, aside from a subjective-substitutive form of direct effect, there exists an objective-oppositive manifestation of direct effect, whereby a directly effective European Union (EU) provision entails the disapplication of national law, without either conferring immediately an individual right or replacing the domes...