<p>You also need internal motivation. You may go to serve others, but if your heart is not 110% in it, it will be a serious hardship.</p>
<p>Serving others (friends, family, country, etc) is a good reason, but be careful that the desires of friends and family are not your driving motivation. You friends and family aren’t the ones up at 0400 working on that history paper, etc.</p>