This quote means that if you choose the job of your dream, you won't feel like your working, it feels like a fun dream your whole life.
This is optimistic because it is saying that if you do what you love you'll be happy.
It will make people want to choose the best job for them so that they can do what they want their whole life!
Bored at home, I want to go to the beach ):
The basic principals of Uniformitarianism were enough to give geologists a sequencial history of the earth but absolute dating using isotope data from igneous rocks gathered using several different techniques (strontium/rubidium, parent/daughter isotope decay rates) and with the combination of these two geologists were able to develop the geological time scale.