Why should your speech focus on ideals?

Don’t just speak – say something. When Michelangelo was tasked with painting the Sistine Chapel, he considered it a thankless job. He would have much rather spent his time sculpting than painting. But he used the occasion to paint perhaps the most revered fresco in history. So, the next time you’re asked to speak, don’t just write a speech, write a great one. A speech’s greatness has as much to do with its values as anything else. No one remembers the speeches of segregationists, though there were no doubt eloquent preachers spewing hate in the days of Jim Crow. No one remembers Hitler’s speeches, though few would dispute his oratorical prowess. Of course, Hitler, like the segregationists, lost. But it’s also because hope will always be more compelling than hate. It’s no accident that the best-known, best-loved speech in history – the Sermon on the Mount – is an articulation of humanity’s highest ideals. Tip: Before sitting down to write, get inspired by reading great speeches from collections like William Safire’s “Lend Me Your Ears.”
the answer is in from the speech

The answer is in the importance of focusing on ideals in a speech. The passage explains that a speech's greatness is determined by its values. It mentions that no one remembers speeches of segregationists or Hitler, despite their oratorical prowess, because their messages were rooted in hate. On the other hand, the most famous and beloved speeches in history, like the Sermon on the Mount, are those that articulate humanity's highest ideals. Therefore, the passage suggests that a speech should focus on ideals because they are more compelling and resonate with people on a deeper level than messages of hate or negativity.