Everytime someone tells me only pastors can preach - I point to this verse. It may be my job to deliver a sermon on Sunday - but you, whether you are male or female, young or old - have a calling to preach. You don't have to be long-winded like me - you just have to tell people what God has done and is doing in your life. And you don't need to go into great detail - sometimes it's as simple as, "I was lower than a snake's belly the other day when I heard my favorite Christian song" or "did you see that sunset - it was amazing" or "how can I pray for you?"