Why is he smiling, knowing that he has endless kilometers to walk to the water? Pepe doesn't know who left those signs, and he's just walking toward his goal with a smile on his face and no matter what. In the same way, you, my friend, should walk toward your goal and not listen to those people who say you can't do something, that you won't make it. Walk past these people and move on, just as Pepe does, who pays no attention to the signs.