How to identify patterns from the comments of users.

I have conducted an online survey in which 1,500 users participated. They have their opinions and comments on particular problems. I am trying to consolidate all your opinions and get patterns from your comments.
It is not easy to read the 1500 comments and create patterns quickly for a single person.

Is there a recommended method that can help me analyze 1500 comments and draw a couple of patterns from these comments?