大毘盧遮那成佛經疏 2.35

2.35

第五「云何癡心？謂順修不觀法」，謂不觀前言善惡是非，遇便信受。凡所為事業，不能先以慧心甄別籌量是非，如是等多諸誤失，皆是癡心相也。

Fifth: regarding "What is the mind of delusion? It means according with and cultivating dharmas of non-contemplation": this means not examining whether previous words were wholesome or unwholesome, right or wrong, but readily believing and accepting whatever one encounters. In all undertakings, one is unable to first distinguish and deliberate right from wrong with a mind of wisdom; having many mistakes and errors such as these is the mark of the mind of delusion.