"You shall walk in His ways", the word "walk," implies an ongoing and perpetual sense of motion.
One of the differences between the soul of a Jew and an angel is that angels are stationary beings, fixed in their spiritual positions, whereas the Jewish soul constantly ascends from one spiritual level to the next. The Jew is constantly in motion, reaching higher and higher spiritual heights by virtue of his actions.
It sometimes happens that a Jew may observe mitzvot, yet he remains on the same spiritual rung as before. His performance of the mitzva did not cause him to progress or ascend any further. The commandment "You shall walk in His ways" comes to teach us that a Jew must never be stagnant, and that his performance of the mitzvot must always lead to an improvement of his overall spiritual condition.
By observing the Torah's mitzvot because they are "His ways" - because of our desire to emulate the Creator, will assure our spiritual ascent to higher and higher levels of G-dliness.
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