All growth is a leap in the dark, a spontaneous unpremeditated act without the benefit of experience.

所有的成长是一种在黑暗中的跳越，一种自发性非预谋没有经验的益处的行动。

youdao

To Cowper, a letter was a kind of serendipitous conversation, like a casual walk, an unpremeditated thing which only stopped when the appointed end had been reached.

ECONOMIST: English letters