Your question is very broad, it could be taken as "How do you justify your faith?" It could be asking how you justify on a document which i doubtI am just going to assume you mean "How does one...
All of us wanted to be successful in a right way but sometimes we thought that we must do a thing through evil or bad way but we forced ourselves not to do it.
It's "the end justifies the means" meaning if you're doing something wrong but for a good reason it's ok. Like Robin Hood stealing from the rich....stealing is wrong but he's giving to or helping the...