He says he feels it in his veins and it makes him strong and he feels as if he could live forever and ever.

Breathe it and breathe it." She was only repeating what Dickon had told her, but she caught Colin's fancy.
"'Forever and ever'! Does it make him feel like that ?" he said, and he did as she told him, drawing in long deep breaths over and over again until he felt that something quite new and delightful was happening to him.
Mary was at his bedside again.
"Things are crowding up out of the earth," she ran on in a hurry.

"And there are flowers uncurling and buds on everything and the green veil has covered nearly all the gray and the birds are in such a hurry about their nests for fear they may be too late that some of them are even fighting for places in the secret garden.

And the rose-bushes look as wick as wick can be, and there are primroses in the lanes and woods, and the seeds we planted are up, and Dickon has brought the fox and the crow and the squirrels and a new-born lamb." And then she paused for breath.

The new-born lamb Dickon had found three days before lying by its dead mother among the gorse bushes on the moor.
It was not the first motherless lamb he had found and he knew what to do with it.