You are in your home, office, or yard. Go up, you are in a neighborhood, town, or city. Go further up. You are on an Island, state, within a country, on a continent, on the earth. Now go further up, we are in a solar system, one planet orbiting the sun among other planets and moons. Go even further, so far that our world, and our sun is but a glimmer in a galaxy filled with millions of other suns swirling around and around. And if you can imagine, our galaxy among other galaxies, millions upon millions of other galaxies, expanding further and further away from each other. Suddenly our own Galaxy has disappeared in the mass of galaxies and has become unrecognizable. Try to find your way back and you'll probably get lost and end up at a completely different planet. But let’s assume you remember your way back to earth and arrive back at were you started out. And think about how fleeting time is and how small we humans are within the major context of things.
To get a visual idea of this you can watch this video: http://www.youtube.com/watch?v=bXrXTx94aFg&list=PL778ADA8A4726F6C2&index=15&playnext=1
Seeing how infinitely huge the universe is, and how small we all are, think about how we got here, the amount of absolute luck we have had from our planet evolving the way it did, being created from nothing into something, becoming able to harbor life and intern us. We are the ultimate product of millions of years of disasters, cataclysms and planetary collisions. Even the creation of our moon and how it orbits the earth has great implications for life on earth. From our earth forming from cosmic matter, being bombarded by asteroids, meteorites, and even another planets, cooling down to the point where water becomes liquid, and then the miracle of life somehow came about from the smallest elements in the oceans. For a better idea of how this all happened for us you can watch this video: http://www.youtube.com/watch?v=16zeA-c-3vw
We are extremely lucky to have ended up as we are. And as the universe is as immense and old beyond our understanding, think of how much life could be out there. Even if only one planet in every galaxy has complex life, there are still millions of galaxies out there.
So before you think that only we are so lucky, and we are somehow alone, thinking how stupid the idea is that we are alone in a universe permeating with infinite amounts of ingredients for life.