A sigurista is someone who is careful to always make sure that everything goes according to plan.

Ang kasalungat ng taong segurista ay taong mapusok.
The opposite of a prudent person is a rash person.
Naniniguro ang sigurista na ang lahat ay wasto.
The prudent person makes sure that all is proper. 
Sigurado ang sigurista na ang lahat ay tama.
The prudent person is sure that everything is right.
Maging sigurista!
Be a prudent person!
= Act prudently!