 लताकण्टकसङ्कीर्णाः कृकवाकूपनादिताः।निरपाश्च सुदुर्गाश्च मार्गा दुःखमतो वनम्।। 
 .The paths full of thorny creepers, echoing with the noise of wild fowls, and with no water to drink are difficult to tread. So forest is a source of suffering.  