Here is a 40 minute lecture that gives a good overview of Biblical theology. It is worth your time.
N.T. WRIGHT part 3 from ETS Productions on Vimeo.
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The distance between God and the creature is so great, that although reasonable creatures do owe obedience unto him as their Creator, yet they could never have any fruition of him, as their blessedness and reward, but by some voluntary condescension on God's part, which he hath been pleased to express by way of covenant