Nine in the fourth place means

Joyousness that is weighed is not at peace.

After ridding himself of mistakes a man has joy.

Often a man finds himself weighing the choice between various kinds of pleasures, and so long as he has not decided which kind he will choose, the higher or the lower, he has no inner peace. Only when he clearly recognizes that passion brings suffering, can he make up his mind to turn away from the lower pleasures and to strive for the higher. Once this decision is sealed, he finds true joy and peace, and inner conflict is overcome.