Rather rejoicing in the doubtfulness of the adventure, I pushed my way over the snow until my feet struck the steps.

To-night he was in an unusually thoughtful humour, and inclined to weigh things in the balance with a doubtfulness as to their value which was new to him.

There is neither a multiplicity of simple ideas to be put together, which makes the doubtfulness in the names of mixed modes; nor a supposed, but an unknown, real essence, with properties depending thereon, the precise number whereof is also unknown, which makes the difficulty in the names of substances.