Does Luke 13:24 give us a more vivid picture of how many people will be saved?

I mean how many times have we said 'let me see' or 'let me try'. Or how many times have we felt like - I'm trying to be a Christian. Seems like trying is not good enough according to [Luke 13:24](http://www.biblegateway.com/passage/?search=Luke+13%3A24&version=NIVUK) : > Make every effort to enter through the narrow door, because many, I tell you, will try to enter and will not be able to. For example, as a Christian, I've been trying to give at least my tithe, but have always failed because I hold back. So if I don't change NOW, I'm not gonna make it. Right or Wrong. Is there anywhere else in the Bible that reads trying is not good enough? There are about 7 billion people on earth. Taking Luke 13:24 in mind, is a FEW like 7000 people.