Jim Rohn was an American entrepreneur, author and motivational speaker. He mentioned the quote above to show that the people we surround ourselves with influences our reality. Imagine hanging out with a peer who you might enjoy spending time with, but when he or she leaves you to feel robbed, this is because he or she might be emitting negative energy based on their thoughts about how they view the world.
To break this concept down into simpler terms, we are all energy and based on the law of vibration, which is a true law if you have not heard of it, states that everything you see around you is vibrating at one frequency or another, and so are you. Hence when you surround yourself with cheerful, loving and vibrant people, you happen to vibrate to a frequency that stimulates your growth. Therefore I will love to conclude by saying don’t be afraid to lose those around you who serve you no purpose and reach out to those that cherish and inspire you.