Rediscovering Baha'u'llah

Sometimes I have feelings of something missing in my life, which lead to thoughts about rediscovering Baha'u'llah. I'm considering ways I might take a fresh look at Baha'u'llah, what He's saying and what to do about it. I'm looking for passages in His writings addressed to us, individually and collectively, telling us what He's all about. Some phrases that come to mind are "O people," "O my friend" and "It is the duty of every seeker . . ." I might start with the Tablet of Ahmad, and the tablet of the true seeker. I would warmly welcome any ideas from anyone.