Be grateful to those who have hurt or harmed you for they have reinforced your determination.

Be grateful to those who have deceived you for they have deepened your insight.

Be grateful to those who have hit you for they have reduced your karmic obstacles.

Be grateful to those who have abandoned you for they have taught you to be independent.

Be grateful to those who have made you stumble for they have strengthened your ability.

Be grateful to those who have denounced you for they have increased your wisdom and concentration.

Be grateful to those who have made you firm and resolute 
and helped in your achievement.
 

Buddhist saying.