I'm a beginner student but I am interested in these kinds of 四字熟語. I am curious how one pronounces this phrase, 寂滅為楽. The kana are じゃくめついらく. My guess is due to vowels being dropped, either something like jak-metsuirak- or jak-mets-irak-. In the first case, it's つい is pronounced like 就いて, in the second case, つ is whispered and い stressed due to 為 being a separate kanji.