There're reasons for every God's command. Quran does not only ask to do this and that or dont do this and that but puts responsibility on every individual to personally question, analyse and verify (39:18, 17:36, 5:105), calls not to accept or follow anything mindlessly, warning that doing so would lead to eventual interrogation by the course of nature (17:36), describes unquestioning minds as polluted (10:100), demands substantiating arguments with hard evidence to validate a conventional belief (2:111, 4:174, 5:104-105, 8:42, 10:100, 11:17, 17:36, 37:156-157), insists that believing in a ready-made proposition or accepting a popular hypothesis, without deep observation and reasoning, is misguiding (2:170, 5:104, 10:100-101, 31:21, 33:67, 37:69-71) and so on.