"Guidance, like all God's acts of blessing under the covenant..." — J.I. Packer quote meaning

Guidance, like all God's acts of blessing under the covenant of grace, is a sovereign act. Not merely does God will to guide us in the sense of showing us his way, that we may tread it; he wills also to guide us in the more fundamental sense of ensuring that, whatever happens, whatever mistakes we may make, we shall come safely home. Slippings and strayings there will be, no doubt, but the everlasting arms are beneath us; we shall be caught, rescued, restored. This is God's promise; this is how good he is.