Working hard with heads is necessary in all kinds conditions, including diverse relationships, but it won't last forever.

However, working hard by heart will touch others' hearts and change others' life and it can last forever.

I learn a nice concept today--When people die, they can't take away anything belongs to themselves originally , but they have left whatever they have given away toward others previously.

"The best and most beautiful things in the world cannot be seen, nor touched ... but are felt in the heart." quoted by Helen Keller, is one of my favorite quotes. Maybe being soft-hearted, tender-hearted, and caring-hearted from the bottom of the heart is the most sincere.