What Advice Would You Give to A New Salesperson?

The Situation
As the Vice President of Sales, you’ve hired a team of people who are new to the sales profession. The morning of the first day of sales training you are going to address the class of newbies. Your goal is to ensure they have the right mindset for their future sales roles with your company.
As you know, there are many myths and misconceptions about sales and this is your opportunity to direct the group down the correct path leading to success.
Your Challenge
If you could only offer ONE SALES TIP to the salespeople that would help them succeed, what would it be?