既来之，则安之

既来之，则安之

Literally means:

since we are here, we may as well stay and make the best of it

Actually means:

to take the world as it is

既 means already. 来之 means to (make them) come. 安之 means to (make them) enjoy. The Literally means is since some people have been asked to come over, they should be well received. In current usage, it usually means since people are here, they should stay and make the best of it. It connotes that one should be free of worries or doubts and face the reality readily.

既，已经；来之，使他（他们）来。安之，使他（他们）安下心。原来的意思是：已经把他（他们）招来了，就要把他（他们）安顿下来现在多用来表示：既然来了，就安心地留在这里。含有不要有什么杂念，安心面对现实的意味。