You are the gardener

First step is noticing that the a thought has arisen. Don't fight it or run from it. Acknowledge it, say 'hello'. Think through if this has any relevance in your present.

If it does, plan the best step forward.

If it does not, take a deep breath and just visualize tha...

With consistent effort, over a period of time your garden will have almost no thorny bushes and full of flowers.

Maybe a few trees as well :)

Use the power of visualization as that too is just a thought. A strong one because you are aware of it.

Come to think of it (pun intended). Thoughts are like plants.

We prefer some - childhood memories, vacations, achievements.

We dislike some - unpleasant memories, past experiences, stress, anxiety.

Most of us trim the flowers and water the bushes, unknowingly....

The more attention and care you give to a plant, the more the yield.

You may either get a thorny bush or a fragrant flower. It all depends on the seed and how much work you put into it.

Given a choice, you'd naturally want more of one kind and less of other.