In simple words, practice is visible and implementable. On the other hand, perception is something emotional and cannot be seen. These two forces might be off opposing nature but they are somehow interrelated to each other.
Our perception are made from our experiences and experiences happens from practice of actions and these perception affect our potential actions.
To enhance our cognitive capacity the best way is to travel and meet different people, communicate with them and know their options and problems.
Because he had power over everything else. He was one of the best president i know what i heard of we had until that trachdy day had to come and takes his life