Without the grace of the Lord, no one can become happy and prosperous.
Srimad Bhagavatam 3.1.26,
The spirit soul can be happy only in the association of the supreme living being, the Personality of Godhead, and nowhere else.
Srimad Bhagavatam 3.2.11,
Actual joy is a product of the spiritual nature. It spontaneously manifests when the living entity begins to love God.
The more we are happy in Krishna Consciousness the more we become purified.
Happiness derived from a combination of the senses and the sense objects is always a cause of distress and should be avoided by all means.
Bhagavad Gita 18.38,
One who is ignorant of scientific knowledge of the spirit soul does not look inside the body to find happiness in the soul; instead, he goes outside to search for happiness
Srimad bhagavatam 7.13.29,