Rav Simcha Zissel Ziv, The Alter of Kelm

“Avohom raised his eyes.” (Genesis 22). The Torah emphasizes that even the raising of eyes should be the result of thought and intent.

From Sparks of Mussar by R Chaim Ephraim Zaitchik

As an aside, please see this story about R Eliyahu Lopian:
While waiting for a bus in Yerushalyim with one of his talmidim, Rav Lopian was learning. At some point he picked his head out of the sefer he had and looked up to see if the bus was coming. Right after he did this, he turned to his student and said something like, “Had I been in Kelm and did this, I would have gotten an hour mussar shmooze.”

The idea being two fold:
a) Looking to see if the bus was coming doesn’t make the bus come any faster
b) It’s a bus. Is a bus so important that you are willing to give up even a second of your seder in learning. Who is in control? You or the bus?