Once you are tough
Sometimes you have to be careful what you wish for, for you may get it. Once you have become tough, you and those around you may not like what you have become.
When times are tough, people want tough people around to save them and to help them back to better times, but they do not want to be around tough people when times are good. As stated above, tough people are not always the biggest and baddest people, but they do have characteristics that are not particularly enduring.
Tough people tend to be cold, practical, and show little true emotion. This behavior may be learned from training, such as soldiers who have been trained to be tough, or it may be behavior gained from experience with tough situations, such as police officers who grow to be tough to deal with their jobs.
Tough people survive, they are good at what they do, and they are good to have around in stressful situations, but they are not necessarily the friendliest or happiest people.
Check out this online copy of the book Get Tough!, written in 1943 by Major Fairbairn, a real warrior who used the techniques in war. the book was written before the current proliferation of "realistic" martial art styles.