優秀な人は自分を疑い、そうでない人は他人を疑う

High-caliber people doubt themselves. Ordinary people doubt everyone else.

社員が言う通りに経営を行えば、会社は必ず倒産する

If you manage your company exactly as your employees say, the company is bound to collapse.

学者になったつもりで勉強せよ

Study as if you were a scholar.