What’s the best gift I have ever given someone?

The best gift I have ever given to someone, is a 15 to 20 pages hand-written pure physics 
notes. I know it may seem nothing that special. However, it was considered as the best gift in my heart. Why?

Firstly, a promise from me to someone, was made. It was a promise to try my every means and my best to help her in reviving her love for the subject, Pure Physics. Since it was a promise, then enough said, I will fulfill it. 

However, even with the strong and sheer will power I had, due to unforeseen circumstances - I nearly did not accomplished it. But, I overcame the obstacles in the end. :)

So I went ahead using colour pens to do up a hand-written notes on Pure Physics for her, knowing that she studies better with the aid of colours. With this, I took about 18 hours over the stretch of three days, to complete it. And finally, I handed it over to her. I still remembered her using her most sincere tone and eyes to say, " Thank you, Ben ". 

I would say that this is the best gift - using my best efforts, with the most sincere heart, to complete it.  

Time passed, and the day for O level results is finally here. On that day, I approached her and asked her, " Did you managed to pass your Physics? ". She told me a yes. That moment was considered to be the best of my life, and I was deeply touched, simply because I believe on her part she has tried really hard as well. I was only considered as the locomotive to her success in Physics. 

P.S. I wish her all the best in the future, and I know she will do well in her everything she do!