The new attitude to work

Some years ago, i had a realisation which till today i still subscribe to it and still believe it is the right attitude towards work.. especially if you are working for other people. Here it goes:

"Work as if you are going to stay forever, but plan as if you are going to leave tomorrow."

So, do you think it has some truth? Somehow it makes me feel more fulfilled, kept me busy & moving forward, and not rest on my laurels.

While some may think it's a bit of a conflicting mindset, it is precisely this. If you have read my post on holding two conflicting ideas or thoughts, you will know what i mean. But seriously, i looked at it as a balanced mindset instead. A positive one and one having the right attitude.

What do you say?