Tao Te Ching, perhaps one of the oldest books still in existence, and perhaps one of the most profound. The original text, written in ancient Chinese has been kindly translated and commented upon by someone I know not who, nor when. Whoever they are, they have the most profound grasp and understanding of the subject matter, and I honour them as a master. Of the many translations of the Tao Te Ching, this one, for me, is the most rewarding.
How to use this book. If you want to gradually transform yourself into someone who is in harmony with nature, who is in touch with their intuition to the point where they can see their interconnectedness with all things, then I recommend that you bookmark this URL and read one passage a day, preferably in the morning. But more than just read the passages, reflect upon them during the day, looking persistently for evidence in your own life of how the principles discussed in the passages apply in your world. Over time, a gradual transformation will occur. Your insight into the nature of the world will be honed to the point where you intuitively understand situations and people in ways that conventional school-based learning cannot teach.
For better results, download the book (zipped executable Rich Text Format) and do the above, but annotate each passage with your own observations and insights, as I have done on many passages (my annotation appears in italics at the end of each passage)
TAO: A road; a path; the way; road; channel; course; principle; truth/reason; argument; sense,.. the way by which people travel, the way of nature and finally the Way of ultimate reality.
De: Virtue, character, influence, heart,mind,kindness,moral force. The "outward effect of a man and the inward effect of the self.