Romans 8.28 is such a well-known verse of Scripture.
(The above translation is from the NIV. Here's the ESV rendering: "And we know that for those who love God all things work together for good, for those who are called according to his purpose.")
It is also one that gets abused a lot. Non-Christians abuse it because they want the "all things together for good" and who can blame them? Christians usually end of frustrated or discouraged because they forget what the "all things" will most likely include.
Now, I'll be quick to add that the non-Christians who misuse this verse are not your average "I live solely for myself and for the world" variety. It's those who either pretend to be followers of Christ or are deceived in their thinking. This verse cannot be for them, because they do not love God, nor are they called according to His purpose. They may sit in the pews of many churches nearly every Sunday, but this verse is not theirs. Oh, that they would repent of their sins, come to Christ and know what it means to love God with their whole heart, soul and mind.
What about the Christians who misuse a verse like this? They love God; they've been called by the power of the Gospel and they are genuinely converted, yet they abuse these words. How? They want the "together for good" but the all things does not include suffering. However, the context of Romans 8, especially verses 17–27 clearly speaks to the suffering we and creation clearly will go through. Unfortunately, there are too many believers who either are not prepared for suffering because they've never been taught that they will suffer or because they have been taught the only thing they'll ever receive from God is what they claim by faith, and they certainly aren't going to claim any suffering!
But the truth of these words is that God, who is mighty to save and able to deliver, will take all things in our life––both the huge blessings of grace and the hard, difficult sufferings of life and evil––and work them for our good. Our good might need to be the pruning of pride or self-sufficiency or covetousness, so God works some loving, gracious, merciful discipline in our life. Or, our good might be to deliver us from temptation by providing that escape which is to say "No!" or "I'm united with Christ and I will not do this thing against His glory."
Whatever it may be, rest assured that if you are called by Him to be one of His dear adopted children, His purpose is always, always, always (did I say always?) for your good. And this is to the praise of His glorious grace.