Do you really need mischief in your life?

Is mischief(little but not too much) really needed in life to enjoy its spice? I have seen in a spiritual book that mischief is played by people who are not calm or cool or satisfied with themselves; so when a person does some spiritual practice like yoga, meditation, or meet a spiritual guru/ teacher he/ she can live a calm and peaceful life without the need to play mischief on anyone. But according to my own experience, I think that yoga requires patience and perseverance which is not impossible to do but it's boring. After a person plays mischief, he/ she finds it more enjoying. Why is it so?