My grandfather, Rav Tzvi Hirsch of Kretchnif zy’a (Hagadah Shel Pesach Chaim V’Emunah) explained the words ‘kol ditzrich yeisi v’yiftach’ (let all who are in need come and open up) by saying that Hashem is called ‘kol’ because is all-powerful and almighty. Thus, we say that anyone who ‘needs kol’, meaning anyone who understands that he needs to get close to Hashem, may come and ‘open up’ to Him and serve Him on this night, and when one does this, He certainly will draw him close.
A Tefillah to be Brought Close
He continues by explaining the words of the Hagadah: ‘In the beginning, our fathers were idol worshippers but now the Omnipresent has drawn us close to serve Him.’ He says that this means that even those who are very far from properly serving Hashem, and even those who have fallen to the low level of serving idols, can ‘now’, on the night of Pesach, draw close to serve Hashem. He says that these words are a prayer to merit being close to Hashem.
Hashem Reveals His Love
Furthermore, on this night, Klal Yisroel receives an extra dose of love from Hashem. The Tiferes Shlomo writes that on this night, Hashem ‘hugs’, so to speak, every Jew. The pasuk states (Shemos 11:5): ‘At midnight, I will go out in the midst of Egypt.’ On all nights at midnight, Hashem enters Gan Eden to connect to the tzadikim (2 Zohar 36:20), but on this night, instead of going to Gan Eden, he comes to our houses as we conduct the Seder.
The verse states (Shemos 14:30): ‘And Hashem saved on that night.’ The Kedushas Levi writes that there are days when Hashem provides goodness for Klal Yisroel and shows His love, and the day when this is felt the most is ‘that night’ of Pesach.