R. Jonah was a thirteenth-century scholar who lived in Spain. Although originally opposed to Maimonides’ philosophical works (most notably, his Guide for the Perplexed), he later changed his views, and even vowed to travel to Maimonides’ gravesite to posthumously beg for forgiveness. (He indeed began the long journey, but passed away before completing it.)
R. Jonah authored Shaarei Teshuvah (an ethical work on repentance), a commentary on R. Isaac Al-Fasi’s halachic compendium, and a commentary on Ethics of the Fathers, among other works.
Others date his passing as 1 or 28 MarCheshvan.
Link: Rabbeinu Jonah Gerondi
Abraham worshipped idols as did his father, Terach.
Terach was an intelligent man, as was his son, Abraham.
But Abraham came to recognize the falseness of the idols, while Terach stayed behind.
Because Terach never truly believed in the idols and never truly worshipped them.
But when Abraham worshipped idols, it was with all his heart, mind and soul, every hour of the day and night.
It had to be real. Everything Abraham did had to be real.
And therefore, he found truth.