尽心竭力 [jìn xīn jié lì]

• strain every nerve; do one's best; do one's level best; do one's utmost; do the most one can; exert one's heart and strength to the utmost; give all one knows and all of one's strength; make all-out efforts; play one's hand for all it is worth; put one's heart and soul into ...; use every effort of body and mind to ...; use one's best efforts; (to do sth.) with all one's heart and all one's might; with all one's mind [heart] and energy:

  It's always something to know you've done the most you could.

  你知道自己已经尽心竭力， 对你自己也是一种安慰。