Carl Gustav Jung (26 July 1875 - 6 June 1961) was a Swiss psychiatrist, an influential thinker and the founder of analytical psychology (also known as Jungian psychology). Jung's approach to psychology has been influential in the field of depth psychology and in countercultural movements across the globe. Jung is considered as the first modern psychologist to state that the human psyche is "by nature religious" and to explore it in depth. C.G. Jung says that in the world we live in, there are certain qualities that are absolute truths. These qualities come in pairs of opposites and you can't have one without the other. Such as - Fullness and Emptiness, Living and Dead, Light and Darkness, Hot and Cold, Time and Space, Love and Fear, Good and Evil, Beauty and Ugliness, to mention a few.
These qualities exist outside of ourselves and inside of us. Therefore, when a person is not in tune with their true nature - their true self [not the false self, which is the EGO] - they are constantly striving to define and attach themselves with these qualities in order to feel like they exist. The danger with that is that when a person strives towards the attainment of the good and the beautiful - for example - and is not in tune with their true nature, they then fall pray to the effects of the opposite qualities - evil and ugly, since these are one with the good and the beautiful. When, however, we remain true to our own nature, we don't identify ourselves with either them, thus freeing ourselves from the effect of both good and the beautiful and from the evil and the ugly.
According to Jung, he emphasized the importance of balance and harmony in ones life. He cautioned that modern people rely too heavily on natural science and logical positivism and that we would benefit greatly from integrating spirituality and appreciation of unconscious realms. He considered this process of individuation necessary for a person to become whole. In summary, Jung asks us to strive not after any of these external qualities which ultimately will always leave you empty, but after YOUR OWN BEING. Bottom line, there is only one striving, the striving after your own being. Once this is clear to you, you would not need anything else, thus you would come to your right goal by virtue of your own being.