You gotta look for the good in the bad, the happy in your sad, the gain in your pain, and what makes you grateful not hateful.
That is great advice, and I especially like the wording of it.
Looking for the good in the bad... there will always be something good to come out of the bad times. If you can unwrap yourself from the misery and look around, there will be a blessing.
How do you put the happy in your sad? Sadness is often completely overwhelming, but it is still a choice. You decide how you are going to feel every day. Depending on the source of the sadness, there may be a time when it fades just enough for the happiness to sneak back in. Most feelings are not permanent, but if you are grieving, all emotions are unpredictable and you may need to fake it 'till you make it.
Looking for the gain in your pain.. what is the pain all about? A physical pain can be a strain or a break, a sign of an illness, or a manifestation of some emotional pain. There is always a message in pain. We are not meant to suffer... there is something that needs to be examined and corrected, or for actual physical damage, worked through and strengthened. But to gain the 'gain', look closely, the pain is an opportunity for growth.
AND practice gratitude, seriously, hating is a waste of time and energy. The haters are simply coming from a place of fear, and can turn it around by being grateful. Try making a list or reciting what you are grateful for each night. There is always something to be grateful for. Leave out the list of what makes you angry or upset and concentrate on what makes you happy. Anger, resentment and hatred will melt away eventually, they can't stand up against gratitude.