In my mind it has to be tough.
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Look at the world for instance, we can agree that there is goodness in the world. A concrete goodness like the air, the water, the land and even our hearts that supply blood by way of the veins throughout our bodies. But more fundamental, I think what else is good is our personal ambition and our success, otherwise we wouldn't strive to do good. Face it, there is a desire for success and as rappers Biggie and 2pac would say, "Get Money."
Humanity throughout the course of history strives for success. We strive for that perfect job, we strive for that perfect relationship and that "dream home." For those in third world countries it's called "El Sueno Americano" or the American dream. The fact is that goodness, is always moving for the greater, we see this because we are always striving for something greater, for something better. Notice that there is never enough money, never a nice enough phone, or (and I love this) never a final Apple Product that tops them all. The beauty is that because of this desire for permanent Goodness, there has to be something that IS greater then all the rest otherwise, there would be an infinite regress of good things. This is Heaven, with perfect unity and relationship with God the father who is the primary Goodness. That continuous desire for goodness is a call to Heaven, a call to holiness and perfection.
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The joy, is that on our journey to success there will be failure and times will get tough, but if its not tough how can we be molded? I like to say when the journey is tough, the destination will be great. If we can see how God is working in our lives through the suffering and through the trials, there will be an awakening of our own spirit, to strive for that goodness and seek true happiness by virtue and holiness. Today, being the feast of St. Thomas Aquinas here's a perfect quote.
"Man's beatitude or happiness consists in this: to see God through God's essence." -Saint Thomas Aquinas