The words buddhim ekanta-samsthitam indicate that as an effect of Prahlada Maharajas preaching, the students who listened to him became fixed in the conclusion that Krsna consciousness is the only object of human life. The fact is that anyone who associates with a pure devotee and follows his instructions becomes fixed in Krsna consciousness and is not disturbed by materialistic consciousness. The teachers particularly observed this in their students, and therefore they were afraid because the whole community of students was gradually becoming Krsna conscious.