1. A man who knows, and knows that he knows. This is the scholar, so take and patiently learn from him.

2. A man who knows, but does not know that he knows. This one has forgotten, so quietly remind him.

3. A man who does not know, and knows that he does not know. This one is a student, so teach him continuously because he will be a great scholar one day.

4. A man who does not know, and does not know that he does not know and isn’t even interested in knowing. This one is an idiot, so reject him".

GORILLA IN THE BLISS: A GORILLA appears to beam with joy as it is surrounded by hundreds of butterflies in an award-winning photo.

The snap of Malui, a western lowland gorilla in the Central African Republic, scooped the top prize in Nature Conservancy’s contest.

Elsewhere a snapper caught the moment wildebeests were bucking and kicking as they jostled in a frenzied crossing of the Mara River in Tanzania.

In another snap a fish found itself on the menu after a predator latched onto its tail while hunting for lunch.

The competition also featured a swimmer retrieving a facemask from the water in a mass of floating litter to highlight the scourge of plastic in the oceans.