"Passing through" means moving across or briefly visiting a place without staying long. It can also refer to being in a short, transitional stage or situation. People often say it when travel plans involve only a quick stop.
If people could realize that we are merely passing through this Earth... That we are guests here... That every meeting with an acquaintance or a friend could be the last, they would be more humble and less cruel. Source: Internet
The Greeks possessed a knowledge of human nature we seem hardly able to attain to without passing through the strengthening hibernation of a new barbarism. Georg Christoph Lichtenberg
It belongs to the imperfection of everything human that man can only attain his desire by passing through its opposite. Soren Kierkegaard
Knowledge about life is one thing; effective occupation of a place in life, with its dynamic currents passing through your being, is another. William James
We are all visitors to this time, this place. We are just passing through. Australian Proverb
We are all visitors to this time, this place. We are just passing through. Our purpose here is to observe, to learn, to grow, to love... and then we return home. Australian Aboriginal Proverb