I have really struggled with this paddox as well, especialy with a family that depends on me.
I believe that unless you really wish to die in this world to be prepare for what comes after, I must find the balance between. So, I believe what is meant in this teaching is to let go of attachment. Don't take more then you need, share your bounty with your neighbors, don't stress about where the next meal comes from or weather your current shelther will be there tomorrow. I don't believe though that I should give up my most basic needs or pass up your current oppertunitys to provide for yourself and love ones.