One verse

Srimad Bhagavatam 6.15.24

6.15.24

द‍ृश्यमाना विनार्थेन न द‍ृश्यन्ते मनोभवा: । कर्मभिर्ध्यायतो नानाकर्माणि मनसोऽभवन् ॥ २४ ॥

drsyamana vinarthena na drsyante manobhavah karmabhir dhyayato nana- karmani manaso ’bhavan

drsyamanah
being perceived
vina
without
arthena
substance or reality
na
not
drsyante
are seen
manobhavah
creations of mental concoction
karmabhih
by fruitive activities
dhyayatah
meditating upon
nana
various
karmani
fruitive activities
manasah
from the mind
abhavan
appear.

These visible objects like wife, children and property are like dreams and mental concoctions. Actually what we see has no permanent existence. It is sometimes seen and sometimes not. Only because of our past actions do we create such mental concoctions, and because of these concoctions, we perform further activities.