It's common to say “I see” when we understand something. And indeed, “seeing” in the Bible represents grasping and understanding spiritual things. So it makes sense that the eyes, which allow us to see, represent the intellect, which allows us to understand spiritual things. This can also be used in the negative, of course; the Bible speaks of people having eyes and refusing to see, and the Lord when He was in the world advised plucking out an offending eye. These represent a refusal to acknowledge truth, or being misled by falsity.

636. 'I will destroy them together with the earth' means that the human race would perish together with the Church. This is clear from the fact that here the phrase 'together with the earth' is used. In fact, as previously stated, 'earth' in a broad sense means love and so the celestial things of the Church. Here because no love, nor anything celestial, was left it means self-love and that which is contrary to the celestial aspect of the Church. Despite this the member of the Church still existed because he possessed doctrinal matters concerning faith. For as has been stated, love includes faith within itself, and faith includes cognitions of faith, just as the earth includes the ground, and the ground includes the field.