Chapter 3 · The Yoga of Action · Krishna said
Bhagavad Gita 3.37 — Desire is the enemy
श्रीभगवानुवाच। काम एष क्रोध एष रजोगुणसमुद्भवः। महाशनो महापाप्मा विद्ध्येनमिह वैरिणम् ॥
śrībhagavānuvāca | kāma eṣa krodha eṣa rajoguṇasamudbhavaḥ | mahāśano mahāpāpmā viddhyenamiha vairiṇam ||
Meaning
Krishna said: It is desire, it is anger, born of the quality of passion (rajas). It is never satisfied and is very sinful; know it to be the enemy here.