An expression meaning 'the more one knows (about something), the more (it becomes X)' — used with the 〜ば〜ほど pattern to show increasing effect as knowledge increases.
その会社のことを知れば知るほど、働きたくなくなった。
The more I learned about that company, the less I wanted to work there.
料理を知れば知るほど、食べる楽しみが増す。
The more you learn about cooking, the more enjoyment you get from eating.
歴史を学べば学ぶほど、物事が単純ではないと感じるようになる。
The more you study history, the more you feel that things are not simple.
彼の話を知れば知るほど、尊敬の念が強くなった。
The more I learned about him, the deeper my respect became.