One of the less “cutesy” sayings in Spanish, but nevertheless tremendously useful is “Cuánto más deprisa, más despacio”.
It has to be some universal human truth, when you try to hurry up because you are late, you get things wrong and have to go back and redo things, making yourself even later. It happens to me all the time as I have the added handicap of needing to be in a rush to get motivated at all! I often think I should be more Buddhist about things (notice the use of the word Buddhist as an adjective describing behaviour).
In the meantime I’ll keep on saying – more haste less speed – “Cuánto más deprisa, más despacio”