Godling Go Home!
Why?
The Silent Colony
Force of Mortality
There's No Place Like Space
Neutral Planet
The Lonely One
Solitary
The Man With Talent
The Desiccator
The World He Left Behind

Original appearances from 1954 to 1959 - in (The Original) SF. Stories (6), or Future SF (5.) "The Man With Talent" was later revised as "A Man of Talent." Several of these appear in later Silverberg collections - but 6 stories can only be found in this 1964 collection.