The difficulties on the spiritual path can be overcome only if the aspirant has one-pointedness. If his energies are dissipated in worldly pursuits, the progress he makes is very slow. One-pointedness implies dispassion concerning all the allurements of  the phenomenal world. The mind must turn away from all temptations, and complete control must be established over the senses. Thus control and dispassion are both necessary to attain one-pointedness in the search for true understanding.
-Discourses 7th Ed. p358