The central message of this sermon is that time is a gift from God, and we must learn to appreciate its fleeting nature by acknowledging our limitations within it. The speaker argues that we have the same amount of time as everyone else, but because we don't own it, we cannot control it or manipulate it to suit our desires. This understanding advances the belief that true wisdom comes not from trying to control time, but from accepting and appreciating its preciousness. The takeaway is that instead of being anxious about time, we should focus on making the most of the present moment and recognizing our own mortality, which can lead to a deeper sense of gratitude, humility, and wisdom.