Thomas Aquinas

Second, the humiliation of the besieged: you shall be humbled; and the sign of their humiliation, you shall speak out of the earth, that is, just as if you were under the earth, so shall you humbly be heard, bearing the words of the python, which chanted silently: I will take away out of the midst of you your proud boasters (Zeph 3:11); or their meriting of humiliation, accusing them of the sin of avarice: you shall speak out of the earth, and idolatry: and your voice shall be like that of the python.

Commentary on Isaiah ↗