It is better to focus on one or a few activities than trying to do so many tasks at once, as you will get better results if you can put all your efforts on smaller groups of activities… Focus focus focus!
Jack of all trades, master of none
Other Proverbs
Donde fueres, haz lo que vieres
En tierra de ciegos el tuerto es rey
A quien Dios se la dé, San Pedro se la bendiga
El que ríe el último, ríe mejor