Scarlett Johansson covers Glamour magazine - February 2008 Sweden [Agencies]

Scarlett Johansson's belief in being ambitious drove her to touch the heights of success.

The American actress, who made her acting debut at the age of eight in a play with Ethan Hawke, revealed that she believes in ambition because it is not only healthy but is a factor necessary to be successful.

"Ambition is healthy. All people who are successful are ambitious. And you have to be ambitious to be successful. And you have to set goals for yourself. I think that's important," the Age.com.au quoted Johansson, as saying.