In this module of Living in the Path, Lama Zopa Rinpoche explains the meaning of an often recited verse: 

A star, a defective view, a flame,
An illusion, a drop of dew, a bubble,
A dream, a flash of lightning, a cloud:
See causative phenomena as such.

This verse, which comes toward the end of the Vajra Cutter Sutra, sets out nine analogies, five for impermanence and four for emptiness. In these teachings Rinpoche urges us to practice mindfulness in our daily lives of how we ourselves and all the objects of our attachment, anger, and ignorance are impermanent and empty of true existence.