That means accepting and believing that, whether God actually arranges the world (it IS a mystery) or intentioanlly created free will in order to force us to CHOOSE Him, we only control our actions, NOT the outcomes.
Outcomes belong to God. Whatever they are, if our actions are Holy the outcomes are Holy.
GWB has accepted his current circumstances as a gift from God and, knowing his actions to be founded on prayer and meditation, believes the outcomes will be Holy, whatever they are.