What are the sentences in ancient poetry or ancient poetry that indicate that everything is difficult at the beginning?

A journey of a thousand miles begins with a single step —— Chapter 64 of Lao Zi

There is a long way to go in Xiu Yuan, and I will go up and down. -Excerpted from Qu Yuan's "Li Sao" in the pre-Qin period.

Pilots know that open source is not easy.

Entrepreneurship is the hardest.

Xiongguan is full of roads like iron, but now it's a step from the beginning-Chairman's representative work "Remembering Qin E Loushanguan"