Similarly, these three qualities, three colors. The yellow is sattva-guṇa and the blue is the tamo-guṇa and the red is rajo-guṇa. These colors, they are representation of these three modes of material nature. Redness means passion, and blue, black, that means ignorance, and yellow, yellow is goodness. Therefore you see Kṛṣṇa and all others, they're in yellow dress. Of course in the spiritual world there is no such distinction. There is variety, but there is no inebriety. That is spiritual world.
Śrīla Prabhupāda's lecture -- Montreal, October 26, 1968