Love bade me welcome: yet my soul drew back,
Guilty of dust and sin.
But quick-ey'd Love, observing me grow slack,
From my first entrance in,
...
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Introduced by a friend, retired English master, the second line confused me, why 'Dust', I wondered but he suggested it might refer to that which sticks to us through life and experience.
Genesis 2: 7 tells how God created man from the dust of the earth and Herbert would have believed in the doctrine of original sin - that all bear the burden of Adam's transgression and are sinful by nature. Love (Christ) both changes and redeems if one is willing to sit and eat.
Thank you Curmudgeon, good response with which I agree.