If you or I were stuck up to our neck in quicksand and someone walked by, we wouldn't just look 'at' the passerby . . . we would look 'UNTO' him.
The difference being looking unto and not at someone, when you are in trouble or in need, is expectancy . . . You would look unto him for help.
" Looking UNTO Jesus the author and finisher of our faith." Hebrews 12