Acharya Prashant clarifies that the spiritual definition of a 'straight' or 'simple' life is fundamentally different from the common worldly understanding. In common parlance, a person who is easily fooled or lacks worldly wisdom is often called 'straight' or 'simple.' However, in spirituality, being straight means following the direct path toward the Self or Truth without getting distracted. The speaker defines the ego as the starting point and the Soul as the destination; moving directly toward the Soul without wandering is true simplicity. He characterizes worldly cleverness and mental wandering as 'crookedness' because they result in a waste of time and energy.