We say these words to fulfil what is said in Gemara, that “we begin (the Haggadah) with our shameful origins and end with our praise”. But why do we have to go into all the details; “Terach, the father of Avraham etc.”
This Gemara provides insight into the essential stages of our Avodah (Divine service). Every birth must involve pain and blood that is halachically impure. Thus, once it was destined that Avraham was to be born, he had to be preceded by Terach. The Midrash explains the verse “Who can derive purity from impurity?” with the example of Avraham coming from Terach.
Similarly, when we say Modeh Ani in the morning, we thank Hashem for making us as a new creation. Since we are “born” anew, it must be preceded with “impure blood”. What is this “impure blood” (negativity)? The daily spiritual routine begins with Krias Shema She’al Hamita, which is an evaluation of our spiritual conduct from the day that ended and how we should improve tomorrow. This is followed by the mourning of Tikkun Chatzos, which is like the removal of the ashes from the Mizbeach in the Temple. These reflections can lower a person's spirit. This is the “impure blood”.
Yet, when we get up in the morning - the time that represents Avraham as it says, “Avraham rose early in the morning,”- we remember how even though Avraham lived in a bad environment as his father not only served idols, but also made and sold them, yet Avraham came from him and became completely devoted to Hashem. This thought – that even from negativity we can rise spiritually - will lift our spirit.
~ Second night Seder 5704
