This is why the Federal Vision authors cannot stand Vos:
Even today the call of the law sounds in our ears: such a life I would give you, if only you could fulfil me! God could have wholly eradicated that relation and have taken away the last traces of it from our minds, after the covenant of works was broken. However, He kept its memory alive in us. He has repeated that promise hypothetically and consequently has held up before us constantly the ideal of eternal life to be obtained by keeping the law, a lost ideal though it be…At Sinai it was not the “bare” law that was given, but a reflection of the covenant of works revived, as it were, in the interests of the covenant of grace continued at Sinai…The covenant is neither a hypothetical relationship, nor a conditional position; rather it is the fresh, living fellowship in which the power of grace is operative. Only by the exercise of faith does it become a reality. It is always believers who act as true covenant partners with God. They who are partners also have the promises in their entirety sealed to them as believers. The covenant is a totality from which no benefit can be excluded. (Redemptive History and Biblical Interpetation, pp. 254-256).