Spiritual growth isn't about knowing a few spiritual or religious principles and quoting the Scripture. Instead, it is about developing a complete lifestyle change every moment that you live. It is about knowing what the right thing to do is, and spending every waking minute striving to be that change.
One way to achieve spiritual growth would be to pay attention to everything you do that's apparent to other people, to change those things. Certainly, that could engender a different kind of behavior in you and help you in your path. But it only helps change on inside. It doesn't guarantee it.
The good thing about spiritual growth is that you don't need to pay any special attention to being virtuous. When you take care of spiritual awareness, the virtue comes on its own. The more you begin to really understand the spiritual nature of everything in this world, the more you lose interest in anything other than honesty self-effacement and kindness. These will not seem like an effort. These will seem like the only option for the sane.
As he begin to learn about your spiritual nature and how it connects to the spirituality of all things around you, you will naturally begin to want for their well-being. You will begin to naturally see all things as you see yourself. Selflessness stops being forced and effortful.
For instance, if you go to a difficult time in your life the loss of a job for instance while you will feel helplessness and frustration, you'll also begin to see how everyone else around you is going through this same thing. You will begin to feel for them and lend them a helping hand. You might start a website to bring people together or perhaps contribute to the efforts someone else makes in this direction.
The great thing about feeling compassion for another through spiritual growth instead of through forcing yourself is that you will naturally gravitate towards helping people who actually deserve it. A great many people who are in pain are often that way because they are not ready to take care of themselves yet. A person who's achieved spiritual growth naturally gravitates towards people who try hard their own.
As you begin to seek the truth, you learn more about what challenges there lie in this endeavor, and you begin to see more clearly how difficult to obtain this is. When you see people who are on the same path as you, you feel sympathy. When you see people who aren't, you feel compassion.