The של״ה הקודש makes a connection between Shlomo Hamelech and yesterday's Parsha. At the end of Kohelet, we have the famous Pasuk: סוף דבר הכל נשמע את האלוקים ירא ואת מצוותיו תשמור כי זה כל האדם. That when looking at all of the endeavors and pursuits of man, when all is said and done, we are to fear G-d and keep His commandments. This is all there is to man.
This was Shlomo's conclusion after pondering and trying for himself that which occupies man. In the end, all is vanity and this world is full of injustices. The only thing that is worthwhile is to fear G-d and keep His commandments, for this is all there is to man.
Similarly, in the Parsha, Moshe asks, "What does Hashem want from you, but to fear Him and keep His commandments and walk in His ways.
And for good measure, King David also uses the phrase, ראשית חכמה יראת ה׳, the beginning of wisdom is to fear Hashem.
We learn from Moshe, David, and Shlomo that what grounds us and keeps us focused is that we always remember to fear Hashem as the basis of our lives.