Could it be ... that the hero is one who is willing to set out, take the first step, shoulder something? Perhaps the hero is one who puts his foot up… - P. L. Travers

If you want to find Cherry-Tree Lane all you have to do is ask the Policeman at the cross-roads. He will push his helmet slightly to one side, scratch his head thoughtfully, and then he will point his huge white-gloved finger and say: "First to your right, second to your left, sharp right again, and you're there. Good-morning." And sure enough, if you follow his directions exactly, you will be there — right in the middle of Cherry-Tree Lane, where the houses run down one side and the Park runs down the other and the cherry-trees go dancing right down the middle.
If you are looking for Number Seventeen — and it is more than likely that you will be, for this book is all about that particular house — you will very soon find it.

Thank you, ma’am,” said Mary Poppins with icy politeness. “But I bring the children up in my own way and take advice from nobody,

Well, what is she, then? And where did she come from?” cried the Fledgling shrilly, flapping his short wings and staring down at the cradle.
“You tell him, Annabel!” the Starling croaked.
Annabel moved her hands inside her blanket.
“I am earth and air and fire and water,” she said softly. “I come from the Dark where all things have their beginning.”
“Ah, such dark!” said the Starling softly, bending his head to his breast.
“It was dark in the egg, too,” the Fledgling cheeped.
“I come from the sea and its tides,” Annabel went on. “I come from the sky and it’s stars, I come from the sun and it’s brightness — “
“Ah, so bright!” said the starling, nodding.
“And I come from the forests of earth.”
As if in a dream, Mary Poppins rocked the cradle — to-and-fro, to-and-fro with a steady swinging movement.
“Yes?” whispered the Fledgling.
“Slowly I moved at first,” said Annabel, “always sleeping and dreaming. I remembered all I had been and I thought of all I shall be. And when I had dreamed my dream I awoke and came swiftly.”
She paused for a moment, her blue eyes full of memories.
“And then?” Prompted the Fledgling.
“I heard the stars singing as I came and I felt warm wings about me. I passed the beasts of the jungle and came through the dark, deep waters. It was a long journey.