He who says nothing (tacitly) agrees; silence is consent

you've got to be cruel to be kind; spare the rod and spoil the child

(figuratively) to have a big head, to be big-headed

Alternative spelling of qui aime bien châtie bien

(informal) you're telling me, you don't say, no kidding, tell me about it

(informal) to have ears that are burning

whoever (in a present sentence)

(informal) concerning, regarding, as for, as to, as far as ... is concerned

whoever (in a past sentence)

(informal) practice makes perfect, you'll get better, you learn from your mistakes