People can't save themselves, that's why we have to rely on God, He's the only one who can save anybody.
Having undertaken for the Glory of God, and Advancement of the Christian Faith, and the Honour of our King and Country, a voyage to plant the first colony in the northern parts of Virginia; do by these presents, solemnly and mutually in the Presence of God and one of another, covenant and combine ourselves together ...
The main way in which Jefferson does this is to use the phrase "we the people" when writing the Declaration of Independence, since this can be meant to mean the people of the entire world.