If we would only testify to the truth as we see it, it would turn out that there are hundreds, thousands, even millions of other people just as we are, who see the truth as we do...and are only waiting, again as we are, for someone to proclaim it. The Kingdom of God is within you.
If you have fear of some pain or suffering, you should examine whether there is anything you can do about it. If you can, there is no need to worry about it; if you cannot do anything, then there is also no need to worry.
Cultivate the habit of being grateful for every good thing that comes to you, and to give thanks continuously. And because all things have contributed to your advancement, you should include all things in your gratitude.
Most people don't grow up. Most people age. They find parking spaces, honor their credit cards, get married, have children, and call that maturity. What that is, is aging.