If success, then sacrifice

Your objective is to make everybody happy and get whatever you wish. But remember that sadness will always accompany you, Ignacio.

Nothing is perfect. Nothing is totally good. Nothing generates eternal happiness, and if you try to look for meaning of life, you will have to break through tons of suffering of many kinds, caused either by your laziness, or by choosing goals too big for your actual status (i.e. your actual knowledge or abilities).

As the ending song of Monster anime, "For the love of life, there's a trade off". Success and Sacrifice are tightly coupled, and we tend to ignore they are too tied. If you feel you are not achieving what you want, think hard about the amount of sacrifice you are investing, because is very probable you need to sacrifice even more!