To build a house for one's ownself conduces not to his happiness but becomes the source of his annoyance. The snake residing in another creature's place of abode, lives in happiness.
गृहारम्भो हि दुःखाय न सुखाय कदाचन। सर्पः परकृतं वेश्म प्रविश्य सुखमेधते॥