Do what is Good!
Motivation can fade.
Habits prevail.
Every now and then, we need to hear a great motivational sermon. It can really recharge out spiritual batteries. But we must avoid becoming a motivational junkie - the kind of person who has to be hyped up emotionally before they can keep on going. If we become dependent on motivational sermons, we will fail miserably in our spiritual life. (We will get weary of the emotional roller coaster. And after a while, all of the sermons will sound the same.)
Instead of depending on someone else to fire us up, get busy helping others. Do it regularly. Make it a part of our life. When "doing good" for others is a habit in our life, then we will find that it happens regardless of our emotions. We will find that we are doing these things because they are rewarding (not just because some eloquent speaker psyched us into it).