Whatever you can do, or dream you can, Begin it. Boldness has Genius, Power, and Magic in it. Begin it Now! (Goethe)

I do not think that there is any thrill that can go through the human heart like that felt by the inventor as he sees some creation of the brain unfolding to success... Such emotions make a man forget food, sleep, friends, love, everything. (Nikola Tesla)
Habit is necessary; 
it is the habit of having habits,
of turning a trail into a rut,
that must be incessantly fought against 
if one is to remain alive.

Edith Wharton