Bhagavad Gita 2.41

व्यवसायात्मिका बुद्धिरेकेह कुरुणन्दन |
बहुशाखा ह्यन्नताश्च बुद्धयोऽव्यवसायिनाम्

Translation

O descendent of the Kurus, the intellect of those who are on this path is resolute, and their aim is one-pointed. But the intellect of those who are irresolute is many-branched.