The above mentioned quote is one of the most powerful quotes by Swami Vivekananda. What he meant by this quote is, we as humans should keep striving for excellence towards self reflection and thus unlock all the available potential in order to reveal the deeper layers of our lives and this is what the ultimate goal of our life should be.
Here, he is not talking about the materialistic goals which we set to temporarily make us feel satisfied. The bigger goal should be kept in mind and one should act and work towards it rigorously, is what exactly Swamiji meant to convey.