One of the key principals of creation and the Torah is Love and Kindness. This love and kindness is found in all of creation.
See Letter 3 of the Nineteen Letters for much more on this.
See Letter 12 of the Nineteen Letters where Hirsch provides an overview of the Mitzvos that train a person to love and a list and brief explanation of the Mitzvos that instruct us to do acts of love.
