It is said that your life flashes before your eyes just before you die. That is true. It’s called Life.
You will find rest from vain fancies if you do every act in life as though it were your last.
Samsara and nirvana are nothing but different manifestations of a basic continuum. So this continuity of consciousness is always present. This is the meaning of tantra, or continuity.
Forever is composed of nows.