Because, as Ramakrishna Paramahansa says:
“If you enter the world without first cultivating love for God, you will be entangled more and more. You will be overwhelmed with its danger, its grief, its sorrows. And the more you think of worldly things, the more you will be attached to them.
“First rub your hands with oil and then break open the jack-fruit; otherwise they will be smeared with its sticky milk. First secure the oil of divine love, and then set your hands to the duties of the world.
“But one must go into solitude to attain this divine love. To get butter from milk you must let it set into curd in a secluded spot; if it is too much disturbed, milk won’t turn into curd. Next, you must put aside all other duties, sit in a quiet spot, and churn the curd. Only then do you get butter.
“Further, by meditating on God in solitude the mind acquires knowledge, dispassion, and devotion. But the very same mind goes downward if it dwells in the world. In the world there is only one thought: ‘woman and gold’.”