Seeing the futility of the transient nature of life is often the first sign of spiritual awakening. So never hesitate to speak with the ungodly about the reality of death. Remind them of its appointment. Make them face the fact that it could seize on them at any moment, and make sure you use the Law to bring the knowledge of sin and prepare the heart for grace.
“What has been, and is now, one of the strongest feelings in the human heart? Is it not to find some better place, some lovelier spot, than we have now? It is for this that men are seeking everywhere; and yet, they can have it, if they will; but instead of looking down, they must look up to find it. As men grow in knowledge, they vie with each other more and more to make their homes attractive, but the brightest home on earth is but an empty barn, compared with the mansions that are in the skies.” D. L. Moody
Ecclesiastes 2:11 Then I looked on all the works that my hands had done
And on the labor in which I had toiled;
And indeed all was vanity and grasping for the wind.
There was no profit under the sun.