Diligence is the quality of being sacrificial.
There is a saying that, "For every prize, there is a price". This statement implies that whichever result you want will cost you something.
Nothing will really be added to you if something have not been subtracted from you. Diligence involve the investment of sacrifice. Diligence may cost you time, money, pain, inconveniences, tears. All of these things are actually like a currency to achieve a particular reward or prize and, the valuable the reward the higher the cost or sacrifice demand, that is the law.
A certain law called the law of vibration is one of the laws of the universe that makes us understand that everything in the universe including human being vibrates at a particular frequency according to their values.
Those things with higher value vibrates at a higher frequency while those of lesser value vibrates at a lower frequency. In order words, the higher their value, the higher the vibration. That means a Nissan Altima vibrates at a higher frequency than a pressing iron.
Then how does this law relates to diligence?
This law also makes us understand that if you want to get something,you must vibrate at a frequency equal or higher than the frequency of that thing; If you vibrate at a frequency lower than it, you may not get it. Your diligence towards that which you want to get sets you at a higher vibration equal or higher than it. The higher the prize the higher the price you need to pay. Imagine a student who want to be the best in class and doesn't study hard, he will definitely not get it because he vibrates at a lower frequency than the success he wants, so the student will surely need to vibrate higher by adding more effort so as to meet the frequency of that benchmark.
Huge success requires huge price.