Yo guys ! So I ran in this dillema and wondering how each one of you is training brains so that it develop as fast as biceps when training. At 20 I was training quite hard and was in great shape but not that smart inside as strong-looking outside. King James version Bible says Gal 6:8 "For he that soweth to his flesh shall of the flesh reap corruption; but he that soweth to the Spirit shall of the Spirit reap everlasting." - That is what apostle Paul said to Galatians in his letter and it means that investing in your Spiritual growth reaps everlasting life in Heaven(considering Christian spirituality) Another but modern Bible version(Living Bible) says the same verse like this - "Those who live only to satisfy their own sinful nature will harvest decay and death from that sinful nature. But those who live to please the Spirit will harvest everlasting life from the Spirit."