As far as i know, the first person in the West to write about the Law of Attraction was Charles F Haanel, in his seminal book The Master Key System, published way back  in  1912.

He wrote, ‘This, as everything else, is governed by natural law, and this law is the “Law of attraction,” which is that Mind is
creative, and will automatically correlate with its object and bring it into manifestation’.

Hindu Buddhist scriptures talked about this concept thousands of years ago. One of the oldest Hindu scriptures, the Brihadaranya Upanishad says, ‘what what we think is what makes us’. Buddha says the same. In later days, various other authors, from Deepak Chopra to the creators of The Secret popularized this concept through best sellers.

Thomas Leonard talked about 28 principles of attraction in his book The Portable Coach.  These are:

1. Become incredibly selfish

2. Unhook yourself from the future

3. Over respond to every event

4. Build a super reserve in every area

5. Add value just for the joy of it

6. Affect others profoundly

7. Market your talents shamelessly

8. Become irresistibly attractive to yourself

9. Get a fulfilling life, not just an impressive lifestyle

10. Deliver twice what you promise

11. Create a vacuum that pulls you forward

12. Eliminate delay

13. Get your personal needs met for once and all

14. Thrive on the details

15. Tolerate nothing

16. Show others how to please you

17. Endorse your worst weaknesses

18. Sensitize yourself

19. Perfect your environment

20. Develop more character than you need

21. See how perfect the present reality is

22. Become an unconditionally constructive person

23. Orient yourself around your values

24. Simplify everything

25. Master your craft

26. Recognize and tell the truth

27. Have a vision

28. Be real, be human

Not having been taught by him or even met him, and only with peripheral reading, perhaps i can be more non judgmental in explaining what I think Leonard means.

Watch this space!