If you have a goal to learn and understand as much about the world as you possibly can before you die, strengthening your power of concentration is not an option, it’s a necessity.
Внимание www.artofmanliness.com/2014/01/30/your-concentr...
Медитация www.artofmanliness.com/2011/09/07/a-primer-on-m...
Концентрация www.artofmanliness.com/2012/08/08/12-concentrat...