Acharya Prashant explains that rejection is often a cause for celebration rather than mourning, especially when the goal being pursued was never truly desired by the individual. He uses the example of someone being pushed into a sport like basketball or an exam like the UPSC due to family tradition or social pressure. In such cases, the lack of heart and energy in the pursuit is the primary reason for failure. He suggests that if one does not heartfully want something, being rejected from it is a liberation from a needless burden or an artificial duty imposed by external forces.