One negative thought can trigger the emotions and infect the natural peace of the mind.
We get entangled in greed, anger, fear jealousy, self loathing, blame… time and space become our preoccupation like a loop and the more we struggle, the tighter it get.
Purification of the mind is required. Guiding the mind towards the empty land, the restful field of Buddhahood.
The contemplation of restful Being the empty space of light and peace is your true home.