“In art and dream may you proceed with abandon. In life may you proceed with balance and stealth. For nothing is more precious than the life force and may the love of that force guide you as you go.”

Youth, Day, Old Age and Night
Bartlett's Familiar Quotations, 10th ed. (1919)

Self-Culture (1838)

Though widely attributed to Coelho on the internet, and originally added here within the section for The Alchemist, this specific form has not been located in any editions available in online searches. The directive "Let love be your guide" is a very old one, and did not originate with Coelho.
Misattributed

Speech at the Carlton Club (19 October 1922) on David Lloyd George, quoted in The Times (20 October 1922), p. 8.
1922
Context: The Prime Minister was described this morning in The Times, in the words of a distinguished aristocrat, as a live wire. He was described to me, and to others, in more steady language, by the Lord Chancellor, as a dynamic force, and I accept those words. He is a dynamic force, and it is from that very fact that our troubles, in our opinion, arise. A dynamic force is a very terrible thing; it may crush you, but it is not necessarily right. It is owing to that dynamic force, and that remarkable personality, that the Liberal Party, to which he formerly belonged, had been smashed to pieces; and it is my firm conviction that, in time, the same thing will happen to our party.

Barbara Walters interview

Small Houses: Their Economic Design and Construction (1922)
Context: Imagination... implies originality. It results in a reflection... of the working mind of the designer.... Imagination may be called the dynamic force in art.... It is the quality which distinguishes the artistic from the photographic representation of nature.

To the Memory of Some I knew Who are Dead and Who Loved Ireland (1917)