John Wesley on 1 Chronicles 29:18

Of Abraham, &c. - A God in covenant with them, and with us for their sakes. Keep forever - Since it is from thy grace that thy people have such willing minds, continue that grace to them, that they may persist in the same generous disposition towards thee and thy worship. Prepare - Or, rather, confirm, thou who hast begun a good work, confirm and carry it on by thy grace.