Excerpt from The Art of Worldly Wisdom by Baltasar Gracián.

cciv Attempt easy Tasks as if they were difficult, and difficult as if they were easy.

In the one case that confidence may not fall asleep, in the other that it may not be dismayed. For a thing to remain undone nothing more is needed than to think it done. On the other hand, patient industry overcomes impossibilities. Great undertakings are not to be brooded over, lest their difficulty when seen causes despair.