Travel, therefore, was necessary for one to develop the mind and expand knowledge of the world.

The classroom teachers reinforce and expand knowledge of this content area in their ongoing programs.

Postgraduate qualification offers the opportunity to expand knowledge and enhance expertise in any particular field.

That's sad for his family but it's stirring that he devoted his life to expanding knowledge.

He liked to rise at midday and work until dawn, devoting himself increasingly to conveying to others the fast expanding knowledge of the universe.