Problems are not stop signs, they are guidelines.
You never know what motivates you.
The secret of getting ahead is getting started.
Be kind whenever possible. It is always possible.
Be gentle to all and stern with yourself.
Never complain and never explain.
It's always too early to quit.
By failing to prepare, you are preparing to fail.
Go for it now. The future is promised to no one.
If you can dream it, you can do it.
Sometimes they are a matter of luck the photographer could not expect or hope for them. Sometimes they are a matter of patience, waiting for an effect to be repeated that he has seen and lost or for one that he anticipates.