Reb Noson of Breslov, Likutey Halakhos, Hil. Shabbos 7:21 (abridged)
Translated by Dovid Sears
The essential reason we travel to the true tzaddikim is in order to merit to teshuvah—to return to God—whatever our circumstances may be. However, if someone travels or goes to a Rebbe for any self-serving reason, such as to receive from him some sort of prestige or public position, he utterly fails to draw close to the tzaddik; for he is traveling there for his own glory. Rather, the essence of drawing close to the tzaddik is when one’s intention is for God alone—so that the tzaddik may draw him closer to God and bring him back from the spiritual straits into which he has fallen. This is why most [chassidim] travel to spend Shabbos [with the tzaddikim]: because the path of teshuvah primarily depends on the holiness of Shabbos.