The words 'isolation' and 'seclusion' have a special meaning in our religion: to stay away from evil and its perpetrators, and to keep those who are foolish at a distance. When you seclude yourself from evil in this manner, you will have an opportunity to reflect, to think, to graze in the meadows of enlightenment.
When you isolate yourself from things that divert you from Allah's obedience, you are giving yourself a dose of medicine, one that doctors of the heart have found to be a most potent cure. When you seclude yourself from evil and idleness, your brain is stimulated into action. The results are increases in faith, repentance, and remembrance of Allah, the Most Merciful.
However, some gatherings are not only recommended, but necessary: the congregational prayer, circles of learning, and all gatherings of righteousness. As for gatherings wherein frivolity and shallowness prevail, be wary of them. Take flight from such gatherings, weep over your wrongdoing, hold your tongue, and be content within the boundaries of your home. By mixing with others based on foolish motives, you endanger the stability and soundness of your mind, for the people you indiscriminately mix with are likely to be experts at wasting time, masters at spreading lies, and skilled in spreading both trouble and mischief
Had they marched out with you, they would have added to you nothing except disorder; and they would have hurried about in your midst [spreading corruption] and sowing sedition among you... (Qur'an 9: 4 7)
I advise you to fortify yourself to your purpose and isolate yourself in your room, except when you leave it to speak well or to do well. When you apply this advice, you will find that your heart has returned to you. So use your time well and save your life from being wasted. Hold your tongue from backbiting, free your heart from anxiety, and preserve your ears from profanity.