Bo:
With the wearing of tefilin we dedicate our senses to Hashem to serve Him. The Rabbenu Hameiri explains that the Rosh has four compartments against the four senses (smell, taste, sight and sound) in the head whereas the arm and hands has one of feeling.
Beshalach:
The holy Ohr Hachaim explains that tefila alone at the yam suf was not sufficient as the Jews were accused of idol worship similar to the Mitzrim. They had to show a mesirash nefesh by getting in the yam before it turned dry to have the midas rachamim overpower the midas hadin. The Kedushas Levi actually sees this being beneficial to the Jews by encouraging the Mitzrim to have a sense of victory and run after them in the sea to get sunk into the water.
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