Constant self vigilance can be achieved by practice and that is the only way to see our thought process and control it to keep desired things in loop and focus. Many time we assemble to meet with preset agenda and by some influence or otherwise we leave track and see whole agenda itself is hijacked by others.
The simple reason for all this is having an ad hoc approach which makes us ineffective while dealing with different situations. Compare a text message with an other text message having some meaningful picture, I feel the other one would be far more effective. At the end of each day if we start counting that how many times we talked non sense and irrelevant things, we would start laughing at ourselves. It is bitter truth and we must accept it for striking right balance in life.
The severity of our unfocused approach is not immediately known. Ask a person about his feelings who missed choosing a right career at the start or anyone who missed on saving while he had very good earnings and they won't even be able to have proper words to express their repentance.
The moot point we should know is whatever we do, we don't have unlimited time so do the right things at right time with right and judicious use of resources available with us.