There is no such thing as an isolated scripture. The Bible is Spiritually discerned. The carnal man can not understand it. God' spirit reveals and guides into all truth. The Bible is doctrinally sound.
Every doctrine is supported by more than one verse, never by a single verse.
The Bible is inexhaustible. One can study it for a life time and never finish learning from it. The whole Bible is needed. All was written for our salvation and benefit, and no part of it can be ignored or cast aside.