Esias 29:15

15 Woe to them that deepen their counsel, and not by the Lord. Woe to them that take secret counsel, and whose works are in darkness, and they say, Who has seen us? and who shall know us, or what we do?

Esias 29:15 In-Context

13 And the Lord has said, This people draw nigh to me with their mouth, and they honour me with their lips, but their heart is far from me: but in vain do they worship me, teaching the commandments and doctrines of men.
14 Therefore behold I will proceed to remove this people, and I will remove them: and I will destroy the wisdom of the wise, and will hide the understanding of the prudent.
15 Woe to them that deepen their counsel, and not by the Lord. Woe to them that take secret counsel, and whose works are in darkness, and they say, Who has seen us? and who shall know us, or what we do?
16 Shall ye not be counted as clay of the potter? Shall the thing formed say to him that formed it, Thou didst not form me? or the work to the maker, Thou hast not made me wisely?
17 not yet a little while, and Libanus shall be changed as the mountains of Chermel, and Chermel shall be reckoned as a forest?

Footnotes 1

The Brenton translation of the Septuagint is in the public domain.