Percentage of devotion towards work!

From a book by Dale Carnegie Institute: 

"The average person puts only 25 percent of his energy and ability into work. The world takes off its hat to those who put in more than 50 percent, and stands on its head for those who devote 100 percent".

In my career I have come across seeing colleagues who belong to each of the categories. I have been one myself who had to play it differently under different circumstances, under different leaders, and for different projects. I believe we all come across similar experiences in our work-life. 

Fact is fact, the circumstances that are impacting our thought process, physical or mental well boing are known to us only. What happens between us and the leaders under whom we work is known to us and not to anyone else. How some projects motivate us and how some don't is known to us. All these cannot be known to the ones who are judging us or assessing us, constantly. Especially when we have been great performers at the beginning of our careers, any impact either the circumstances, leaders or different projects may have on us is the weak-link that mostly leads to questioning our integrity towards work. It's all different for different individuals, hence do not want to generalize further. And it's nothing wrong with the people who judge or assess us based on our performance. After all, what's seen is what's appreciated, although what's done is not always what's seen! 

I doubt if discussing things openly will help. It might further worsen the situation. We must let the time pass and comeback to our fullest performance all by ourselves. Everything is within us. The external factors like the ones said above can impact only temporarily. Its all up to us as to how we wish and work towards developing and growing ourselves.