What's something in Islam that makes you feel a bit of awe or worry sometimes?

Sometimes I think about Yawm al-Qiyamah (the Day of Judgement), and honestly, it gives me a sense of awe and a bit of worry, you know? And the thought of being in the grave alone... it's a heavy feeling, SubhanAllah. May Allah SWT grant us all a good end and make us among those who are safe. Ameen.