Having a dream

Some say that to have/having a dream is a good thing. When you have a dream you have a goal to go for, and everything you do becomes meaningful. The expecting, waiting, and finally cheering - all these things are beautiful and wonderful. However the others say that to have having a dream is a bad thing, especially when you can't realize the dream it /when the dream is unattainable/when the dream cannot be realised. It's like 'buying'/using/paying a prostitute, it takes up all your time and money when you are young, and finally go away from deserts/leaves/abandons you when you get old. So what do you think of it?

http://www.englishpage.com/gerunds/part_1.htm

Both gerunds and infinitives can be used as the subject or the complement of a sentence. However, as subjects or complements, gerunds usually sound more like normal, spoken English, whereas infinitives sound more abstract. In the following sentences, gerunds sound more natural and would be more common in everyday English. Infinitives emphasize the possibility or potential for something and sound more philosophical. If this sounds confusing, just remember that 90% of the time, you will use a gerund as the subject or complement of a sentence.