Four principles = Krsna consciousness

These four principles. Always think of Krsna, become Krsna’s devotee, worship Krsna and offer your respect, obeisances to Krsna. That’s all. This is Krsna consciousness.

From Srila Prabhupada’s lecture on Bhagavad-gita 2.12 — Hyderabad, November 17, 1972