As Jawaharlal Nehru said, "Life is like a game of cards. The hand that is dealt you represents determinism; the way you play it is your own will."
How well are you playing your hand? I was somewhat of a card shark growing up. The great Muhammad Ali taught me card tricks while I spent time at his training camp with my family. My primary game was Gin Rummy.
As Mahatma Gandhi said, "I will not let anyone walk through my mind with their dirty feet."
Who do you let into your consciousness? Your mind is the home to your thought-life. To stay focused and accomplish anything of significance you need clarity. It's hard enough to keep your mind-space clutter-free with your own flow of thoughts.