A phrase meaning '...is not everything' or 'not the only thing that matters' — used to say that something alone is not sufficient.
お金ばかりが能ではない。大切なのは健康や家族との時間だ。
Money isn't everything. What's important is health and time with family.
成績ばかりが能ではない。協調性や実行力も評価される。
Grades are not everything. Cooperation and the ability to carry things out are also valued.
見た目ばかりが能ではないから、中身を見ることが大事だよ。
Appearance isn't everything, so it's important to look at what's inside.