Everything Is in Heaven's Hands but One Thing
Hashem decides almost everything in a person's life, but whether he fears Heaven is left entirely to him.
Rebbi Chanina teaches that everything is in the hands of Heaven except the fear of Heaven. Hashem decides a person's health, his wealth and the circumstances of his life, but whether he stands in awe of Hashem is the one thing left completely to him. He learns this from the verse "And now, Israel, what does Hashem your G-d ask of you, but to fear Hashem your G-d." Hashem asks it of us because it is in our hands to give. The Gemara adds that this fear is the most precious thing in Hashem's treasury. So the one thing we truly own is the one thing Hashem treasures most, and each person's choice to give it is his own.
Source: Talmud Bavli, Berachos 33b (on Devarim 10:12); parallel in Megillah 25a
Much of today is out of your control: the traffic, the news, other people's moods. One thing is fully yours. Choose a single moment today, before you eat, before you speak in anger, or as you begin Shemoneh Esrei, and pause for a breath to remember that Hashem is watching and cares. That small act of yiras Shamayim (awe of Heaven) is the gift only you can give.