Only ... from personal experience [can a man] take the necessary measures without a preliminary process of trial and error.
![Only ... from personal experience [can a man] take the necessary measures without a preliminary process of trial and error.](http://cdn.quoteddaily.com/images/karl-donitz/only--from-personal-experience-can-a-man-take-the-necessary-measures-without-a-preliminary-process-of-trial-and-error.jpg)
Only ... from personal experience [can a man] take the necessary measures without a preliminary process of trial and error.