Isaiah 64

Isaiah was privileged to see many things. Thus he was more than qualified to write -

"For since the beginning of the world men have not heard, nor perceived by the ear, neither hath the eye seen, O God, beside thee, what he hath prepared for him that waiteth for him." (Old Testament | Isaiah 64:4)

As if referring to Isaiah, Paul taught the Corinthians much the same thing -

"But as it is written, Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love him.
10 But God hath revealed them unto us by his Spirit..." (New Testament | 1 Corinthians 2:9 - 10)

President Thomas S. Monson recently said -

"We become so caught up in the busyness of our lives. Were we to step back, however, and take a good look at what we’re doing, we may find that we have immersed ourselves in the ‘thick of thin things.’ In other words, too often we spend most of our time taking care of the things which do not really matter much at all in the grand scheme of things, neglecting those more important causes." Thomas S. Monson, “What Have I Done for Someone Today?” Ensign, Nov. 2009, 85

Therefore -

"...Treasure these things up in your hearts, and let the solemnities of eternity rest upon your minds.
35 Be sober. Keep all my commandments." (Doctrine and Covenants | Section 43:34 - 35)