Watch what you think

Thoughts are our own ideas that constantly abound in our mind and that allow us to act and make decisions before life. The heart plays an essential role in our thoughts, for the word of God tells us that as our heart is, so will our thoughts.

Source
It is demonstrated by the word of God that what we speak determines our thoughts and the attitude of our hearts.

Mark 7: 20-23
Then he added: "What comes out of the person is what contaminates them." Because from within, from the human heart, evil thoughts, sexual immorality, robberies, homicides, adulteries, greed, evil, deceit, debauchery, envy, slander, arrogance and folly come out. All these evils come from within and contaminate the person.
| NIV |

In this sense there is a call from God to take care of what we say, that is, to take care of what comes out of our mouth since what comes out of our mouth are the thoughts that accumulate in our mind and invade our hearts and become words.
Our words are influential and they will determine an attitude and will obviously have an effect, so we must take care of our thoughts!
To take care of what you think is to take care of your thoughts is to take care of your heart is to take care of your whole life!
About this Pablo said:

Romans 12: 2
And do not conform to this world; But transform yourself by the renewal of your mind, so that you can see what the good will of God is, pleasant and perfect. (Reina Valera Gómez)

Let's take care of our thoughts and not submit to the thoughts of the world because they have nothing to do with God's thoughts for us.
God longs for our mind to be renewed and transformed to speak a new word and for our thoughts to be submitted to the word established by God-
If we submit to God we will also submit our words to his will as well as our thoughts.

Let's look diligently and examine our thoughts now, that they will determine our future and the development of our personality.