How does one overcome fear, grief, and lamentation through transcendental knowledge?

To overcome fear, grief, and lamentation, one must first awaken to the transcendental knowledge that the soul is eternally existent and never subject to destruction, for these anxieties arise solely from the false identification with the temporary material body. As the Supreme Lord instructs, "For the soul there is neither birth nor death at any time. He has not come into being, does not come into being, and will not come into being. He is unborn, eternal, ever-existing and primeval. He is not slain when the body is slain" (BG 2.20). When one deeply comprehends this spiritual reality, the illusion of loss dissolves, and the grief that stems from bodily conception of life ceases, because, as Krishna notes, "Those who are wise lament neither for the living nor for the dead" (BG 2.11). Furthermore, transcendental knowledge equips the seeker with the practical discipline to endure the temporary fluctuations of material existence without being overwhelmed, for happiness and distress are like the alternating seasons of winter and summer, arising from sense perception and destined to pass away (BG 2.14). By constantly training the mind to tolerate these dualities without disturbance and fixing one's consciousness upon the eternal Supreme, the soul gradually frees itself from the fear of future loss and the lamentation of past conditions. Thus, through the steady practice of spiritual wisdom and detachment from the temporary material senses, one ultimately transcends all anxiety and abides in the eternal, blissful nature of the soul.