'Leader' in the Bible

So let no one boast in men [about their wisdom, or of having this or that one as a leader]. For all things are yours,

For who regards you as superior or what sets you apart as special? What do you have that you did not receive [from another]? And if in fact you received it [from God or someone else], why do you boast as if you had not received it [but had gained it by yourself]?