There is a tendency among many people to turn God into some mystical being, all the easier to dismiss him and his promises in the future. Such folk pat themselves on each other's backs for their "rationality" and a touted "evolution" beyond a supposedly foolish belief in God. These acts are, at their very heart, pride that they can handle their own affairs in their own way and without help: this is categorically foolish - biting the hand that supports you from day-to-day.
We do so much better in life and happiness when we humbly align ourselves with God's purposes. When we obey him, things tend to go better for us! His promise is that he will prosper us and that prosperity will come in very concrete forms. I am grateful for a literal God that rewards us, not just "spiritually", but in very physical and tangible ways.
Book of Mormon, Helaman 12:1 - 2:
...yea, we can see that the Lord in his great infinite goodness doth bless and prosper those who put their trust in him.
Yea, and we may see at the very time when he doth prosper his people, yea, in the increase of their fields, their flocks and their herds, and in gold, and in silver, and in all manner of precious things of every kind and art; sparing their lives, and delivering them out of the hands of their enemies; softening the hearts of their enemies that they should not declare wars against them; yea, and in fine, doing all things for the welfare and happiness of his people;...
When the Lord speaks of prosperity and promises that he will prosper you, this is what it will look like. It will be very obvious, though we may discount it or choose to say that our own strength gave us these things. I, for one, always try to credit God for any good fortune that I enjoy!
Who does he prosper? "...those who put their trust in him." It can also be more precisely understood by the conditions under which the Lord will not prosper us:
Book of Mormon, Helaman 12:2:
...yea, then is the time that they do harden their hearts, and do forget the Lord their God, and do trample under their feet the Holy One...
If you acknowledge the Lord and obey his commandments with gratitude to him for all that you have, he will provide you with more as he has promised!
Would you like prosperity in your life? My advice would be to attribute the good things you have to God and show him your appreciation through following the path and commandments of Christ. The promised prosperity will follow!