Paraphrase: The true adventurer proceed, having no particular aim, no selfish calculation. He meet and welcome challenges of unknown fate.

真正的冒险家勇往直前，不计较，不安排，迎接未知的命运。

youdao

Like a and steep cliffs fighting the running stream, you should be plunged into the vast unknown fate, then a dauntless spirit to overcome it, no matter how many difficulties to provoke you.

像一只和陡峭的悬崖搏斗的狂奔的激流，你应该纵身跳进那茫茫的、未可知的命运然后以大无畏的精神战胜它，不管前面有多少困难向你挑衅。

youdao

The fate of the three men is unknown.

这三个人命运未卜。

《牛津词典》

Sedova said that four people have been confirmed dead, two were injured and the fate of two others remains unknown.

NPR: Ukraine: 4 Dead, 2 Injured In Crash-Landing

The fate of "Bunheads" is still unknown, but it can count Graham among its devoted fan base.

CNN: 'Gilmore Girls' reunion? Someday, someday, maybe

The fate of the former Iraqi leader remains unknown.

CNN: Pentagon: 'Major combat' over, but smaller fights remain