People rub off on each other. It's why a smile on someone's face can make you feel better, or why a coworker's negative attitude can ruin your day. In fact, the attitudes and behaviors of the people in your world are so influential that your best strategy for succeeding in life may be to remove complainers, drama magnets, braggarts and the disingenuous from your circles.

A different kind of personality exists, however, which is a true blessing: The highly grounded individuals you know. Here's why you need more of these people in your life, or, at the very least why you should appreciate the ones you have.

1. They're unshakeable.

In the midst of a crisis, you need people who can calmly get the right things done without panicking, exhibiting stress or otherwise losing their cool. A truly grounded person helps others by demonstrating that whatever happens is not the end of the world.

2. They're reliable.

When it comes to coworkers, partners and friends, things run smoother when people show up when and where they're supposed to. They don't make excuses for being late or underperforming because it's not the way they conduct themselves. Instead, they plan ahead so they're able to meet their commitments on time and to specifications.

3. They possess an unwavering moral compass.

These are not the people who typically wake up regretting the stupid things they did the night before. People with scruples make those around them see a higher standard.

4. They're humble.

Truly grounded people don't feel a need to intentionally impress others. This is opposed to braggarts who will drain your energy as you mentally filter the truthfulness of their verbal acrobatics.

5. They have a healthy self-esteem.

Without being cocky, the grounded people you know understand their value and project a quiet belief in their own abilities. This kind of self-assurance helps them take risks and pursue opportunities, making them people you should want to follow.

6. They don't worry.

Think about the biggest worriers you know. How do you feel after listening to their perceptions of all the terrible things that may go wrong? Alternately, grounded people understand that whatever happens, they can handle it. This attitude is a comfort to be around.

7. They stand up for what's right.

They take stances on issues that matter, but do so without being preachy or self-righteous. At the same time, they intuitively understand which battles are worth fighting.

8. They don't conform so people will like them.

Truly grounded people don't feel compelled to follow the pack just to gain acceptance from others. They tend to have the attitude that if doing something the right way means doing it alone, so be it.

9. They encourage others to succeed.

Grounded people don't need everything to be about them, and enjoy helping others reach their true potential. These are the kinds of friends you need in your corner.