舍不得孩子套不找狼。

It refers to "No Pain No Gain"

first of all,you have to break the egg to get core of egg and then put in the the pan to make an omlet...So without breaking the egg,you cannot make an omlet. i would translate if i knew in your language but hope it stands experessive...

Something that you say which means it is difficult to achieve something important without causing any unpleasant effects Eg: Two employees will be sacked if the company's not going to be made more efficient. But you can't make an omelette without breaking eggs.