Do you love gardening?
What do you plant in your garden? Flowers, grass, tree, vegetables and etc.
I believe you don’t have intention to plant “weed” in your garden. However, weed will grow by itself and it grow WELL and FAST if you are not removing it. Gradually, your plants are going to die and weed will grow more” prosperous” if you are not paying any attention.
Our mind is just like a garden, if you are losing your mindfulness, thoughts are arisen like “weed”, you are not at Now, not be here and there.