Mindfulness starts with self-awareness, knowing yourself enables you to make choices about how you respond to people and situations. A deep knowledge about yourself enables you to be consistent, to present yourself authentically. Grounding allows you to notice the subtle clues that tell you to attend carefully to self, others or your surroundings. A mentor that I have in business explains it to me that being grounded is like a balancing act - balancing our experiences with our purpose, our emotions. This can also be framed as acceptance, instead of struggling with certain thoughts and feelings accept and acknowledge this is how I'm feeling without the need to act.