Arjuna asked: how does one get beyond the gunas? Krishna's answer is direct. Whoever serves Me through unwavering, single-pointed bhakti yoga completely transcends these three gunas and becomes fit to realize Brahman.
After all the analysis of sattva, rajas, and tamas, after all the descriptions of signs and conduct, the actual method turns out to be startlingly simple: devotion. Not a complex meditation technique. Not years of philosophical study. Devotion to Krishna, offered without wavering, without a divided heart.
"Avyabhicharena" — without deviation — is the key word. Many people have devotion, but it shifts. Sometimes they are devoted, sometimes distracted. Sometimes to Krishna, sometimes to worldly gains. The qualifier here is steadiness. Unwavering bhakti, like a river that has found its course and flows only toward the ocean.