What are the qualities to enter heaven?

Many appear to consider that there is a burning hell somewhere on or beneath the boundary of our heavenly sphere, and can scarcely give up the idea of everlasting punishment.

The only hell is in the thought or soul of the sinner, and he must be cleansed of evil thought—must be taught the first essential quality of heavenly life, which is unselfish service, looking away from self and growing persistent in the effort to help others.