Watchfulness means being alert, attentive, and observant to what is happening around you. It is the ability to pay close attention and be careful to notice any potential dangers, risks, or changes in the environment. Full definition
He speaks, for example, about the need to subordinate our own desires to God's will, and about the importance of watchfulness in place of calculations: «You know not the day nor the hour.» (religion-online.org)
After them, Luke has the ones about constant watchfulness, which are given near the end of Matthew's Gospel (Lk 12:35 - 46; Mt 24:43 - 51; 25:1 - 13). (religion-online.org)
Placed here at the end of this chapter, these warnings are made to speak of watchfulness in the face of the coming Son of man. (religion-online.org)