Being watchful of your actions throughout the day means that your mind is staying with that which is the priority: namely, ‘the guarding of the gateway’ of your mind, so that there are no obstructions for it. That’s the sole task—which can be outlined through discipline, guarding the senses and moderating your eating. You will end up just having to guard the entrance of the gateway, so you don’t have to be running around. The gateway is that one entrance into the city which is walled all round, and that ‘wall’ is your discipline and sense restraint. That’s why virtue and celibacy are not optional if you want to practice rightly.
Ajahn Nyanamoli Thero
Cattāri Brahmavihārā 
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