Never give up because its gets you absolutely no where. Regret is a feeling that can keep us downhearted for a long time. When we are in a funk it rubs off to those around us and , quite possibly sends them seeking other kinder people to hang out with, so keep trying, as in the quote, if you get knocked down seven times get up eight.
I think I can vouch for the words to the song and to the message from this motivational quote. Recently I started using a resistance band workout I came across on you tube. It only lasts 10 minutes but is filled with 6 or 7 strength training exercises. The trainer suggests doing the video 3 times. The first time I could only do it one time, however, now I look forward to it and know that I have gained strength so the hurt was only for a short time and I love the results! It makes me feel good to know I have accomplished something good for my muscles.
Incidentally the trainer has the most authentic Brittish accent and while doing the exercises she exclaims several times to "feel the burn".
My point is: No matter how fast or slow, persistence will get you there any way you choose as long as you do it. Sometimes we have to stick our neck out to reach the next phase in this healthy journey. Stick your neck out to try something new when you reach a plateau.