Where does 'contentment' fit in walking the path of Dhamma?

'Contentment' means being at ease with what you have and not desiring more. But, of course, if I am content with my present situation I will not strive towards Nirvana, and if I am not content and desire for more I invite suffering. **Is 'contentment' described in any of the Buddhist scriptures? How to make use of it in the path towards Nirvana?**