What a tragedy, for dua is the most potent weapon of a believer. It can change fate, while no action of ours ever can. It is the essence of ibadah or worship. With it we can never fail; without it we can never succeed. In the proper scheme of things, dua should be the first and the last resort of the believer, with all his plans and actions coming in between.
We should ask for all of our needs: those related to this world as well as those related to the Hereafter. Those who only concentrate on the former are, in effect, announcing that they don't care for their life in the permanent abode. They should blame nobody but themselves for the total ruin in that world that Qur'an assures us awaits them. Those who only concentrate on the later are also showing lack of balance, for we need Allah's help to lead a good life here as well.
We should make dua not only for ourselves but also for our parents, brothers and sisters, spouses and children, relatives and friends, teachers and other benefactors, and destitute and struggling Muslims everywhere. We should pray for them for the good in this world as well as in the Hereafter. The Prophet said: "The dua of a Muslim for his brother (in Islam) in his absence is readily accepted. An angel is appointed to his side. Whenever he makes a beneficial dua for his brother the appointed angel says, 'Aameen. And may you also be blessed with the same.'" [Sahih Muslim]
"The Power of Dua" - Khalid Baig