Loyalty

 Most people know the expression "blood is thicker than water" but what some of that population will tell you is that the extended quote is actually "the blood of the covenant is thicker than the water of the womb". This slight difference in phrasing/paraphrasing completely changes the definition of the word. 

The first implies that your blood relatives have a stronger bond with you than the rest of the population because those others are constantly changing, receding with the tides. The latter expression implies that those same blood bonds are not nearly as strong as those which you form with others of similar personality and forethought. Which can be very true. Sometimes your family is only there for you because they expect you to be able to do the same if not more for them later. Whereas friends you have made throughout your life may be willing and able to drop anything in a second to help you no matter what they may be doing and expect nothing in return.

I have done that for a number of my friends and have had a few of them do it for me as well.

The most astonishing thing to me though will always be whose mind you occupy space in. Loyalty spreads deeper than just words and actions, it is subconscious too. Somebody may say they will be there to help you out and may even show up to help out, but how many of those people are going to see something in a store and think of you? How many people are going to see a post online, laugh at it, and think that you would find it funny too? Those people have a more pure form of loyalty in my book. They subconsciously spend time thinking about you even when they don't have to.

Those are the types of people I would want to have in my group. The kind that will be there 1000% of the time even when you don't expect them to be.