Make a start with yourself, and abandon yourself. Truly, if you do not begin by getting away from yourself, wherever you run to, you will find obstacles and trouble wherever it may be. People who seek peace in external things – be it in places or ways of life or people or activities or solitude or poverty or degradation – however great such a thing may be or whatever it may be, still it is all nothing and gives no peace. People who seek in that way are doing it all wrong; the further they wander, the less will they find what they are seeking.

Source: Meister Eckhart

C. S. Lewis counsels a former student who is “in a trough.”