You can voluntarily decide to give your kidney… and feel the ultimate joy. If you are healthy. Otherwise, but, have knowledge of a fatal disease; you could do a good before your end…. And live even after life. If you are not mentally prepared to donate your kidneys, you could be part of the cause by donating monetarily for those patients who cannot afford the costs of a transplant… which is quite high. Good deeds need not necessarily be donation….