I'll see if I can find a link. It's just a given. You can't guarantee anything. You definitely can't guarantee that you won't lose money. That's not possible. And you can't state for a fact that a stock will reach a certain price.
If you read through any 10Q's or 10K's for any company, you'll see the portions that talk about risk, guarantees and safe harbor.
The most valuable commodity I know of is information
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