These are they which came out of great tribulation, and have washed their robes and made them white in the blood of the Lamb. God's holy place is heaven. But only those who are pure in heart, and clean in life shall dwell there. Holiness is indispensable to present happiness. The unholy person cannot be happy.
People seek after pleasure because the are unhappy.
The pleasures of the world are short-lived and unsatisfactory. But he who is holy has a never-failing spring of enjoyment within. In whom, though now ye see him not, yet believing, ye rejoice with joy unspeakable, and full of glory. The voice of rejoicing and salvation is in the tabernacles of the righteous. Holiness is essential to usefulness.