The arrival of leaders has also concentrated minds and made people think I don't want to be the minister responsible for my leader coming here and being behind the eight ball. (dotearth.blogs.nytimes.com)
The point I wish to make is that, without the proximity of a powerful concentrating mind, no changes would take place in the sealed vessel. (faith.org.uk)
Indeed, there may be many criminals for whom nothing else concentrates the mind enough. (firstthings.com)