There are different levels of happiness and different kinds of suffering. Material things usually correspond to physical happiness, whereas spiritual development corresponds to mental happiness. Since our "I" has these two aspects--physical and mental--we need an inseparable combination of material progress and internal, or spiritual, progress. Balancing these is crucial to utilizing material progress and inner development for the good of human society.
Big schemes for world development arise from this wish to gain happiness and relieve suffering. But there are higher levels of happiness beyond these worldly forms, in which one seeks something longer-term, not just confined to this lifetime. Just as we need a long range perspective that protects the environment, we need an internal long-range perspective that extends to future lifetimes.
--from "How to Expand Love: Widening the Circle of Loving Relationships" by H.H. the Dalai Lama, translated and edited by Jeffery Hopkins