Napoleon Hill wrote in his bestselling book Think and Grow Rich, "There are no limitations to the mind except those we acknowledge." Do you say to yourself, "I am too old/young/fat/skinny/rich/poor/educated/uneducated/white/black/gay/straight/hairy/hairless/sheep/goat to be learning a new language [or insert any formidable-sounding thing]." Realize this kind of negative talk is self-defeating and that you are your own worst enemy.