Halakhah su Salmi 10:17

When praying you must concentrate on the meaning of the words that you utter with your lips, as it is said: "Guide their heart, let your ear be attentive."¹¹Psalms 10:17. Many prayer books have been published with translations,¹²Obviously this is also true of the Prayer Books that have been translated into English and other languages. enabling everyone to study and understand the meaning of the prayers. If you are unable to concentrate on the meaning of the words, at the very minimum, while praying, you should think about matters that humble the heart and direct your thoughts towards your Father in heaven. Should a profane thought enter your mind in the midst of the [Amidah] prayer, you should be silent [cease praying] and wait until the thought vanishes.