In 2 Nephi 9:51, Jacob teaches the people of Nephi, "Wherefore, do not spend money for that which is of no worth, nor your labor for that which cannot satisfy."

I am pondering this today. What do I spend money on that is of no worth? My mental list is already growing. On what do I spend my labor? What does satisfy? These are perhaps the harder questions.
Why do you suppose Jacob taught this? Is there greater wisdom in these few words than first meets the eye? What is the result of following this advice?

I turned next to my somewhat random reading through the Gospels of the New Testament, today in John 6 (KJV) and this whole chapter seems to be an answer to some of the questions I posed. These verses stood out to me especially:

26 Jesus answered them and said, Verily, verily, I say unto you, Ye seek me, not because ye saw the miracles, but because ye did eat of the loaves, and were filled.
27 Labour not for the meat which perisheth, but for that meat which endureth unto everlasting life, which the Son of man shall give unto you: for him hath God the Father sealed.
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35 And Jesus said unto them, I am the bread of life: he that cometh to me shall never hunger; and he that believeth on me shall never thirst.
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40 And this is the will of him that sent me, that every one which seeth the Son, and believeth on him, may have everlasting life: and I will raise him up at the last day.
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44 No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day.
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50 This is the bread which cometh down from heaven, that a man may eat thereof, and not die.
51 I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever: and the bread that I will give is my flesh, which I will give for the life of the world
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56 He that eateth my flesh, and drinketh my blood, dwelleth in me, and I in him.
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66 From that time many of his disciples went back, and walked no more with him.
67 Then said Jesus unto the twelve, Will ye also go away?
68 Then Simon Peter answered him, Lord, to whom shall we go? thou hast the words of eternal life.
69 And we believe and are sure that thou art that Christ, the Son of the living God.