Who said "The simplest solutions are often the most effective."?

This quote is attributed to Sarah Walker.

The simplest solutions are often the most effective. - Sarah Walker

"The simplest solutions are often the most effective."

Sarah Walker

"I'm a spy. It's what I do. It's who I am."

"You can't always control what happens to you, but you can control how you respond."

"Trust is everything in this business. Without it, you've got nothing."

"I've learned that the people you care about are worth fighting for."