In Zen Buddhism, the greater your doubt, the greater will be your enlightenment. That is why doubt can be a good thing. If you are too sure, if you always have conviction, then you may be caught in your wrong perception for a long time.
Nhat HanhCivilisations have been destroyed many times, and this civilisation is no different. It can be destroyed. We can think of time in terms of millions of years and life will resume little by little. The cosmos operates for us very urgently, but geological time is different.
Nhat Hanh