Should service businesses use debt to grow and scale, or stay debt-free?

I was talking to an older gentleman about this one day and he said something that stuck with me, "Banks aren't in the business of giving money to people they don't think are going to pay them back. If you secure a loan from a bank it's because they believe in you". I took that in a way that, I believe my business is going to succeed and the bank thinks so too, so using the debt they allow you is a good thing!