Bhagavad Gita 2.41
व्यवसायात्मिका बुद्धिरेकेह कुरुनन्दन। बहुशाखा ह्यनन्ताश्च बुद्धयोऽव्यवसायिनाम्।।2.41।।
vyavasāyātmikā buddhirekeha kurunandana| bahuśākhā hyanantāśca buddhayo'vyavasāyinām||2.41||
vyavasayatmika buddhirekeha kurunandana bahushakha hyanantashca buddhayo'vyavasayinam2.41
Meaning
Those who are on this path have a resolute, single-pointed determination. The intellect of the irresolute, however, branches out endlessly in all directions, scattered by countless desires.
हे कुरुनन्दन! इस मार्ग में निश्चयात्मक बुद्धि एक ही होती है, परन्तु अनिश्चित मन वालों की बुद्धियाँ अनेक शाखाओं वाली और अनन्त होती हैं।
This is verse 41 of 72 in Chapter 2 (Sankhya Yoga) of the Bhagavad Gita.