Hashem is Watching
It states (24:62), רואי לחי מבוא בא ויצחק. Rebbe Henoch of Alexander zt'l explained, ויצחק, laughter, and happiness, בא, comes לחי מבוא רואי, when one believes that the חי, living Hashem, רואי, sees him. Because when one believes and realizes that Hashem is always watching and taking care of him, he will be happy.
The Degel Machaneh Efraim explains the pasuk as follows: יצחק represents fear of Hashem. בא, fear of Hashem comes לחי מבוא רואי, when one believes and knows that Hashem is always watching over him.
A Lubavitcher chassid escaped World War Two by going to Shanghai and then to Montreal, Canada. Every day, he davened for a very long time. Once, he kept repeating over and over again, the pasuk from Ashrei ודור דור בכל וממשלתך עולמים כל מלכות מלכותך, "Your Kingship is in all worlds, and Your reign is in every generation." Someone asked him why he was saying this pasuk so many times, why he didn’t just move on with the tefillah. He replied, "It's good for me here, why should I move on?"
We can also say, "How good it is when one remembers עולמים כל מלכות מלכותך, that Hashem is everywhere, and His kingship rules over everything."
