Deep in the forest a call was sounding, and as often as he heard this call, mysteriously thrilling and luring, he felt compelled to turn his back upon the fire and the beaten earth around it, and to plunge into the forest, and on and on, he knew not where or why; nor did he wonder where or why, the call sounding imperiously, deep in the forest. But as often as he gained the soft unbroken earth and the green shade, the love for John Thornton drew him back to the fire again.

She was thrilling to a desire that urged her to go forward, to be in closer to that fire, to be squabbling with the dogs, and to be avoiding and dodging the stumbling feet of men.

The explorers seek happiness in finding curiosities, discovering new lands and undergoing risks in adventures. They are thrilling. But where is pleasure found? Only within. Pleasure is not to be sought in the external world.