it is called for ungrateful and kindness person, the one who gives pain to the kind person

to bite the hand that feeds one, an ungrateful person harms his benefactor

one praises him who pays him, money commands obedience

forgive someone's favor or goodwill, to harm someone who was the beneficial earlier

to bite the hand that feeds

the one can do the work that he learns

root of Rhinacanthus nasuta

one who is not daring cannot get anything, one who is shameless gets the benefit

as or like the root of castor

the one who is dominant who does exploitation

might is right, the one who has power the one is possesses

the pot calls the kettle black

service (job) is very unreliable and uncertain, one can be fired at any moment