If you think, if a prisoner thinks that "I am in this cell. Let me request the superintendent of the jail to change my cell and I'll be happy," that is a mistaken idea. One cannot be happy so long he is under the prison walls. One should become free. That should be the aim of our life. So we are trying to be happy by changing the cell, by this "ism" to that "ism," by capitalism to communism, from communism to this "ism," that "ism." That will not make us happy.
-Lecture on SB 2.3.17 -- Los Angeles, July 12, 1969

मात्रास्पर्शास्तु कौन्तेय शीतोष्णसुखदुःखदाः ।
आगमापायिनोऽनित्यास्तांस्तितिक्षस्व भारत ॥ १४ ॥
O son of Kuntī, the nonpermanent appearance of happiness and distress, and their disappearance in due course, are like the appearance and disappearance of winter and summer seasons. They arise from sense perception, O scion of Bharata, and one must learn to tolerate them without being disturbed.
-BG 2.14