It's better to have a lesser but certain advantage than the possibility of a greater one that may come to nothing. Más vale pájaro en mano que ciento volando

You only have to hint something to wise people in order to get them to understand it A buen entendedor pocas palabras bastan

Someone who makes threats all the time seldom carries out the threats Perro ladrador poco mordedor

THAN

You should be cautious, if you are not, you may regret it Más vale prevenir que curar

If you wake up and get to work early, you will succeed A quien madruga Dios le ayuda

To reveal a secret or a surprise by accident Irse de la lengua

To solve two problems at one time with a single action Matar dos pájaros de un tiro

You should not get upset about something bad that has happened that you cannot change A lo hecho pecho

You have started something or are involved in it, you should complete the work although it has become more difficult that what you had expected De perdidos al río

Fathers and sons resemble each other, and sons tend to do what their fathers did before them De tal palo tal astilla

The final difficulty in a series La gota que colma el vaso

To be difficult or even imipossible Buscar una aguja en un pajar