This quote first reminds us that no one and nothing is holding us back it is just the wall of thoughts beliefs and ideas we have constructed holding us back in our littleness instead of claiming our magnitude.
We can play the blame game and say well my upbringing and the people around me made me this way they taught me these thoughts and beliefs and that is true. Let me ask you something (how is that working out for you?) is playing that game telling you to begin taking down that wall or reinforcing it?
If you want to stop playing the blame game and start taking down the wall, one great step you can take is to become aware of them and start to question them once you are aware of them. What value is this holding? How will my life look in a year if I continue to believe this? If I was willing to think differently what might make me feel a little better? This is not hard but it is different because a good majority of the time we don't question these thoughts we just go on autopilot and believe them.
There might be some discomfort and if there is then you know that you are being to remove some loose bricks.