The reason to add the quote “DO THE THING YOU FEAR TO DO AND KEEP ON DOING IT... THAT IS THE QUICKEST AND SUREST WAY EVER YET DISCOVERED TO CONQUER FEAR." DALE CARNEGIE SUCCESS into the essay and it’s tie to the thesis courage is an important human trait to have in life to overcome all of your fears, doubts, and pain.

Adding the quote from Dale Carnegie supports the thesis statement by reinforcing the idea that courage is indeed an essential trait in overcoming fears, doubts, and pain. The quote emphasizes the importance of taking action and consistently facing one's fears as the quickest and most effective method to conquer them.

By including this quote in the essay, it strengthens the argument that courage is not only necessary but also the surest way to overcome various challenges in life. It encourages individuals to confront their fears head-on and persevere in doing so. This ties directly to the thesis, which discusses courage as a vital trait for overcoming fears, doubts, and pain.

Furthermore, the quote from Dale Carnegie adds credibility and authority to the essay's argument. Carnegie was a renowned writer and speaker in the field of self-improvement and success, making his words highly influential. Thus, incorporating his quote helps to reinforce the message of courage and its significance in overcoming obstacles.

Overall, the inclusion of Dale Carnegie's quote serves to strengthen the essay's argument by providing a powerful and authoritative statement about the importance of courage in conquering fears, doubts, and pain, aligning perfectly with the thesis statement.