People are busy and being brief is therefore a highly useful skill.
Thus, if you want to persuade people, never provide more than three logical arguments to support a case.
Here is why.
Logic makes people think, while emotion makes them act.
Adding more reality-based logic is often not the answer to persuade others. This behavior is called lost in logic. If three good arguments won’t do, ten additional mediocre arguments won’t help either.
Instead, different ingredients, such as appealing to emotions, are necessary.
We can take a page from the playbook of lawyers. Court scenes on television are typically dramatized, but often contain a grain of truth. We never see a case led by insurmountable logic. We always see the logical arguments used to support the main emotional arguments.
Present your best three arguments. Any additional arguments would only weaken your case.