When to use it
Use it when someone asks why something has to be done, especially something tedious or urgent. Give the real reason. People work harder and make better choices along the way when they understand why it matters.
Example
Teammate: “Why do we have to finish this by Thursday?”
You: “Here's why this matters: the client renewal depends on it.”
In an email or Slack message
In a team message: “Priority this week is the client report. Here's why: their renewal depends on it, and they review it Friday.”