The truth is balance, but the opposite of truth, which is unbalance, may not be a lie.
The Langlands program is not a theory but a web of conjectures and theorems that, if fully established, would unite number theory and representation theory.
There are two ways to extend a business. Take inventory of what you are good at and extend out from your skills. Or determine what your customers need and work backwards, even if it requires learning new skills.