A “sage” (sabio) is a wise person.
“Sage” is also an adjective. An example: Ricardo is very sage: this means that he is very wise. He always thinks sagaciously (sagazmente, el adverbio). We all must think more sagaciously.
There is another use. Are you the cook in the household?
If so, perhaps you use sage (salvia) in your cooking. Sage usually goes well with fish and chicken. When you roast (asar) a chicken, you make a “sage and onion stuffing” (relleno de cebolla con salvia). This is typical for the British.
So, use sage, be a sage, and think and act sagaciously.