When some one stay " in the moments " then mindfulness is automatically come out 

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what is actually meditation? /आध्यात्मिक रूप से ध्यान क्या है?

( All about "That")--
तत् (Tat) is a Sanskrit(संस्कृत) word, which means in English "that" ( वह). In the Vedic order    the GOD is also known as तत् (that) or Brahmm. Because the supreme can never explained like "this" it stands  always like "that"  (अदृष्टो दृष्टा:)
                                                          ॥॥हरि ॐ तत्सत्॥॥