Happiness and distress appear and disappear like winter and summer. They arise from the perceptions of the senses and one must learn to tolerate them without being disturbed.
Bhagavad Gita 2.14One without self-control cannot have a clear intelligence or a steady mind. An unsteady mind finds no peace, and without peace where is joy?
Bhagavad Gita 2.66The soul can never be cut to pieces by any weapon, nor burned by fire, nor moistened by water, nor withered by the wind.
Bhagavad Gita 2.23In this Age of Kali, people are full of faults, but there is one great quality: simply by chanting the holy names of God, one can be freed from all material bondage and attain the supreme goal.
Śrīmad-Bhāgavatam 12.3.51