Final answer:
Stendahl means that being ignorant can have serious and harmful consequences.
Step-by-step explanation:
In the quote, "Ignorance is fatal, Mr. Garrett," Stendahl means that being ignorant can have serious and harmful consequences.
Stendahl is emphasizing the importance of knowledge and the dangers of not being informed or aware.
Ignorance can lead to making wrong decisions, being vulnerable to manipulation, or missing out on opportunities.