For even so a man that taketh a journey if he holdeth to one sure road, shall quickly make an end of his journey and of his toil. But if he essay many roads, he wandereth and maketh never an end of his toil, because of such wandering there is no end. William of St. Thierry
When a man lacks discrimination, his will wanders in all directions, after innumerable aims. Those who lack discrimination may quote the letter of the scriptures, but they are really denying its inner truth Those whose discrimination is stolen away by such talk grow deeply attached to pleasures and power. And so they are unable to develop that one-pointed concentration of the will, which leads a man to absorption in God. Bhagavad Gita
There is no mind to control if you realize the self. The mind having vanished, the self shines forth. In the realized man, the mind may be active or inactive, the self remains for him. Ramana Maharshi
The mind of one meditating on a single object becomes one-pointed. And one-pointedness of mind leads to abidance in the self. Ramana Maharshi
The desire to find the Self will be surely fulfilled, provided that you want nothing else. Nisargadatta Maharaj.