If I realized the entire cosmos depended on me, I would conduct myself as if I were already a being with the knowledge of how great a power I possess and how great a responsibility I have towards all life. I have thought a lot lately about claiming my God-beingness in the here and now, and imagining I have the attainment of an Ascended Master. So if I knew the entire cosmos depended on me, I would conduct myself constantly with grace, compassion, and realize that my every action affected others. I would have a greater awareness of the power of my actions and release as much love to others as possible. I would realize how small my human self is in comparison to my true nature and let human concerns fall away. Because I would know how powerful I AM, I would be gracious and kind to others, seeking to give them love and understanding to help them on their unique soul journey.
There was a great presentation at the World Freedom Conference by Hespera Purdin about "How to be a Drama King or Queen" and she talked about how Prince William and Kate Middleton 'played the part' of King and Queen for their wedding in their graceful conduct, in acting respectful, etc. and carrying out their duties with a manner of stateliness that is expected of royalty. I loved the analogy of acting like a King or Queen and carrying out the duties of being in the public and setting a good example for people.
I love It's a Wonderful Life. George Bailey has to be shown how important his life has been in the lives of others and how he's made the world a better place because he can't see it himself. It shows that none of us fully realize the extent of the effect of our actions on our world. I know there are people and instances that have meant a lot to me that the other person may not realized was important, and I would think perhaps I have affected someone in a way I may not have realized has been important for them. I hope so, anyway! Musing on this question encourages me to find those opportunities to make a difference to a person, my community, finding ways to bring positivity into my environment and really take in the people I interact with daily so that I can bring love and kindness to them.
To summarize, if I knew the universe depended on me, I know everyone would be watching me to see what I was doing, so I would make sure to be my best Self and be on my best behavior