An expression meaning 'the more one thinks about it...' used to indicate that thinking further makes something clearer or more complicated.
考えれば考えるほどその提案には問題点が多いと感じる。
The more I think about the proposal, the more I feel it has many problems.
彼の言い分は考えれば考えるほど腑に落ちない。
The more I think about his explanation, the less it makes sense to me.
この事件は考えれば考えるほど複雑になっていく。
This case becomes more complicated the more one thinks about it.