If you are totally concerned and preoccupied with the affairs of this lifetime, there is a great danger of causing your own downfall. If by such concern you were able to achieve the desired happiness, that is okay, but this is not the case.
We all let ourselves be caught in this web of preoccupation with the activities and confusion of this lifetime. Having too much worldly involvement ends in confusion. We spend our whole lives thinking that this might be better than that, I should do this, or perhaps something else is better and I should do that.
If you reflect upon the underlying dissatisfaction, then you will be able to find that, well, after all, whatever they might be, the affairs of this lifetime are not that important, because they yield a limited benefit. This does not mean that you should not work for your own livelihood, but it does indicate that you should not be preoccupied with that alone. (p.107)
–from ‘The Path to Bliss’ by H.H. the Dalai Lama