Yaakov is forced to flee from his parent’s home. On his way to Haran he stops to spend the night. As he prepares to retire for the evening the Torah records his preparations,
"ויקח מאבני המקום וישם מראשתיו"
(he took from the stones of the place and he put them around his head).
Rashi explains that Yaakov constructed this barrier to protect him from dangerous animals.
The Elder of Kelm, (not to be confused with the Elder of Chelm) asks an obvious question. If Yaakov was indeed concerned with the possibility of being attacked by wild animals, why did he take steps to protect only his head while leaving the rest of his body vulnerable?
The Elder answers that Yaakov understood clearly that his protection comes only from Hashem, and that no amount of preventative maintenance would protect him from a determined fate. Still, Yaakov knew that we are still obligated to take steps to avoid dangers.
While it is not these steps that protect us, as our protection comes only from Hashem, we are required to put in our Hishtadlut. (effort) to ward off potential dangers.
Thus while Yaakov was putting in the necessary effort, (as is required), he still displayed his unwavering faith that everything, including our very lives, is in the hands of Hashem.
Rabbi Don Pacht