Be Effective! is what my preacher said God wants us to be. I immediately thought about how I can be effective and what came to mind was being positive, giving more positive energy when I'm around people, being more effective in life and what I want to do in my life. Being effective in God's word (He has accomplished everything! why wouldn't we want to follow in his footsteps. Whatever you need in life you have to look at it in a positive view. You CAN'T doubt yourself and expect to accomplish your goal.
(According to the Oxford dictionary) Effective means "achieving the intended result".
You can do anything when you put your mind to it. Never loose faith in yourself and most importantly God.