We all have to recognize the tremendous opportunity that we have. As humans we have this rare intelligence, but there is a real danger that we will waste it. Death is certain, but when we will die is totally unpredictable. We could lose our precious human existence at any moment. With such reflections, we must motivate ourselves to do something meaningful right now. The best way to make your human existence meaningful is to really engage in the practice of Dharma. During formal sitting meditation and in between sessions, in different ways, be mindful and introspectively vigilant. Keep constant watch on your mind.