What idiom is there a cross and a character in a heart?

What is the idiom that the heart has a cross and a figure of eight (10 to the eighth power)?

10 to the eighth power = 1 100 million homophonic meaning. The answer is wholeheartedly.

Explanation: there is only one thought, and there is no other consideration.

From: The Story of the Three Kingdoms, Biography of Wei Zhi and Du Shu: "Free from Shu Ren, moved to Zhangwu County, the first year of Jiaping." Pei Songzhi quoted Du Xin's book: "Therefore, push wholeheartedly and go straight."

Example: So Guan Peng is in charge of defense, while Zhuangzi puts the army in charge of military equipment.

◎ Zhang Qingchun's Official Sea Chapter 4

Grammar: combination; As an attribute or adverbial; With praise.