Solomon
Proverbs 15:22ESV·traditional attribution

Without counsel plans fail, but with many advisers they succeed.

Matthew Henry Presbyterian @wholebiblehenry

See here, 1. Of what ill consequence it is to be precipitate and rash, and to act without advice: Men's purposes are disappointed, their measures broken, and they come short of their point, gain not their end, because they would not ask counsel about the way.

John Gill Reformed Baptist @doctorgill

Without counsel purposes are disappointed,.... If a man determines and resolves upon a matter, and at once hastily and precipitately goes about it, without mature deliberation, without consulting with himself, and taking the advice of others in forming a scheme to bring about his designs, it generally comes to nothing; see Luk 14:28; or "without a secret" (s) without keeping one; if a man divulges...

Jamieson-Fausset-Brown Reformed @jfbcommentary

Without counsel--or, "deliberation," implying a wise deference to the opinions of the wise and good, contrasted with rashness.