Rav Nachman of Breslov - 3

Sichot HaRan 274 -

"It is very good for a person to have a special, private room to worship G-d through learning and praying, specifically through seclusion and conversing with G-d."

While Judaism is a communal religion, there is also a need for private contemplation. This idea is not unique to Rav Nachman. We see this idea in Maimonides' Guide for the Perplexed (3:51, P. 386 in the Friedlander translation). Seclusion for Maimonides is how we achieve some form of nearness with G-d.