Thinking about God is not at all what St. Teresa of Avila is talking about when she makes reference to the mind and wild horses. Vain worldly and distracting thoughts are the wild horses that need to be tamed – not loving thoughts about God, who is the very root and center of our lives and existence.
I just read in a very well acclaimed book first published in 1899 on the catechism explained that we should always think about God. I believe that what is meant by “thinking about God” is not just our having conscious thoughts about Him, for we couldn’t possibly have/experience conscious thoughts about Him all day. “Thinking about God,” I believe also includes our doing everything in our day for His glory and honor and our seeking His Will in everything. If we do everything in our day for Him, seek His Will in everything and see Him in everything we experience and see around us, we are in a sense thinking about Him all the time.
The love, silence, faithfulness, obedience, self-abandonment, the seeking of His glory and honor and of His Will deep within our hearts when we are busy and occupied with some occupation or when we are quietly before Him in the tabernacle can speak louder to Him of our love, gratitude, contrition, etc. than words can. But words are very good and valuable when they are spoken from the heart. Some people may tell you that it is better never to use words with God. I disagree with them, as I have read saints who were spiritual directors teach the value and necessity of frequent ejaculations to God throughout the day. Besides, vocal prayer and ejaculations have had a good and most valuable place in the lives of Saints. It is a mistake to neglect making ejaculations/aspirations to God throughout the day. Please do not be deceived by what you read about contemplation.
We should ALWAYS be occupied with God, that is, we should always be “thinking about God” one way or another during the day – not necessarily only with conscious thoughts about Him and spoken words to Him – but with the silence of love and obedience/submission burning in our hearts for Him during our busy occupations and our quiet prayer-time. God bless you.