1. There is no limit, there are no barriers
there is no end to what you can achieve, the sky's the limit
If you say 'the sky is the limit' what you really mean is that there is no limit. This is usually used to talk about there being no limits to success, opportunities or cost. This is a colloquial idiom which is usually used in spoken English. "In this company, there is no limit to your commission, the sky is the limit in terms of how much you earn." "Weddings nowadays are full of extras and personal touches and the sky is the limit when it comes to potential costs.