Only tears of devotion come from the soul, and are beneficial for the yoga, Sri Aurobindo thaught in Light on Yoga.

In the teachings of Sri Aurobindo and Letters on Yoga (often associated with works such as Lights on Yoga), tears are seen as a physical expression stemming from either the deep soul (the psychic being) or the lower emotional/vital plane. Psychic Tears (Tears of Devotion and Joy) Source: These tears come from the inner soul-being that lies behind the heart. Meaning: They arise from a deep silence, peace, surrender, or an intense yearning for and love of the Divine. Approach: These are not sad tears of sorrow. Sri Aurobindo states that one should not suppress such psychic tears of joy or devotion, as they are a sign of a healthy spiritual opening. Vital Tears (Tears of Drama and Depression) Source: The vital (emotional and impulses) plane of man. Meaning: The vital part can sometimes revel in the drama of suffering, remorse, and lamentation ('luxuriating in tears'). Approach: Such disturbed, selfish, or sorrowful tears accompanied by depression or hopelessness must be discouraged. They disturb inner peace and are not considered helpful for yoga.