Conversation so far:
What were some of Charles Taze Russell’s publications?
In 1881, Russell published his first work to gain wide distribution: Food for Thinking Christians.
What did Food for Thinking Christians amount to?
The 162-page pamphlet was published using donated funds amounting to approximately $40,000 (current value $1,038,483).

Question: What was the pamphlet all about?
Self-contained rewrite: What was the pamphlet Food for Thinking Christians about?