His Israel's, watchmen are blind The priests, prophets, and other teachers; he mentions only the teachers, because ignorance was most shameful in them; but hereby he supposes the gross ignorance of the people. They are all ignorant Of God's word and will, and of their own and the people's duty, and of the true Messiah, and the nature of his kingdom. They cannot bark They are also slothful and negligent in instructing the people, and do not faithfully reprove them for their sins, nor warn them of their dangers, nor endeavour to keep them from errors and corruptions in doctrine, worship, and conversation, as they ought to do: sleeping, lying down, &c. Minding their own ease and safety more than the people's benefit.
Related Commentaries of Isaiah 56:10
Isaiah 56:10
10 His watchmen are blind: they are all ignorant, they are all dumb dogs, they cannot bark; sleeping,b lying down, loving to slumber.