The idiom "lazy sheep thinks its wool heavy" refers to someone who complains about a burden that they have brought on themselves through their own laziness or lack of effort. There are several synonyms that convey a similar message, including "reap what you sow," "you made your bed, now lie in it," and "putting the cart before the horse." These phrases all imply that the person in question is responsible for their own problems, and that they should take ownership of their actions rather than blaming external factors. By using these phrases, we can remind ourselves and others to take responsibility for our actions and work hard to achieve our goals.