Thinking that we are never going to succeed to conquer our emotions is a restriction on the road to freedom. We are human. We will always feel emotions. Emotions are closely related to the body, a body we cannot deny it exists, we cannot cease to eat or go to the toilet. (at least not for long)
However, we can try to moderate our own expression of those emotions, just like we have the politeness of keeping a hand in front of the mouth when we yawn, cough or burp.
Indeed, we have to moderate our anger.
Jealousy and hate are certainly contrary to freedom, but the latter two are not emotions, but figments of the mind. The same mind that makes the convention that we should conquer our emotions in order to advance spiritually. The same mind that says we should conquer mind, in order to advance spiritually.
Both ‘should’-s are self made conventions, a hurdle – if not a wall – in the face of freedom.