The great Sage Hillel tells us to: "Be a student of Aaron: love peace and pursue peace." (Pirkei Avos 1:11)
When you love someone or something, the object of your love is a high priority for you. In the Torah we read how Jacob was willing to work seven full years in order to marry Rachel whom he loved. The Torah tells us that these seven years were considered as just a few day in his eyes. Imagine loving peace to this same extent.
When you've integrated a love for peace, you will be willing to put in much energy and effort to attain it. You might have to make sacrifices. These sacrifices come in many forms. When love is a motivating factor, you are more likely to make the necessary sacrifices.
(from Rabbi Zelig Pliskin's book: Harmony with Others, p.13, www.artscroll.com)