Why did Lord Krishna say lust is the greatest enemy of the living entity?

In the Bhagavad-gītā (BG 3.37), Lord Śrī Kṛṣṇa explicitly identifies lust (kāma) as the all-devouring, sinful enemy of this world. Lust is born from contact with the material mode of passion (rajo-guṇa) and, when unsatisfied, inevitably transforms into fiery wrath (krodha). It is compared to fire, which can never be extinguished by adding more fuel; rather, the more one indulges in sense gratification, the more the burning desire increases. In BG 3.43, the Supreme Lord delivers the ultimate solution: knowing the eternal spiritual self (ātmā) to be transcendental to the physical senses, the flickering mind, and even the material intelligence, one must steady the mind by deliberate spiritual intelligence. By taking shelter of devotional service to Kṛṣṇa (Bhakti-yoga), the living entity gains the transcendental strength to conquer this seemingly insatiable enemy.