I don't really think it's a contradiction. I think the idea, rather, is to focus on expanding the depth of your life (abundance), knowing you have little control over the length of it (scarce).

And here's a Buddhism quote for the rescue:

> Someone came to him [Ajahn Chaa] complaining of all the conflicting advice he gave to his students. Sometimes he would suggest one thing and then later just the opposite. Ajahn Chaa replied, “It’s like this. If I see someone walking down a road and about to fall off into a ditch on the left, I’ll shout, ‘Go right.’ Later, if the same person, or someone else, is walking on the road and about to fall into a ditch on the right, I’ll say, ‘Go left, go left.’ It’s always about staying on the path.”

from Joseph Goldstein, _Mindfulness_ (2013)