Let a Person Feed on the Promises of God

Is it possible that God’s promises are given less consideration and value today than in the time of evangelist Dwight Moody? Moody described the preciousness of God’s promises this way:

Let a man feed for a month
on the promises of God, and 
he will not talk about his poverty. . . . 
If you would only go from Genesis to Revelation
and see all the promises made 
by God to Abraham, to Isaac, to Jacob, 
to the Jews and the Gentiles, 
and to all His people everywhere;
if you would spend a month feeding 
on the precious promises of God, 
you would not go about . . . 
complaining about how 
poor you are, but you would lift up your heads 
with confidence and proclaim the riches of His Grace,
because you could not help it.