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.

Siddur Im Dach, Lulav.