Hebrews 6:11-15 (ESV)
And we desire each one of you to show the same earnestness to have the full assurance of hope until the end,  so that you may not be sluggish, but imitators of those who through faith and patience inherit the promises.  For when God made a promise to Abraham, since he had no one greater by whom to swear, he swore by himself,  saying, “Surely I will bless you and multiply you.”  And thus Abraham, having patiently waited, obtained the promise.
The faithful will inherit the promises made to them. Period. The author has said to some in the church in verse 11 that he desires them to show earnestness and inherit the promises. If they do not it will not be the fault of the promise Maker. God has made the promise. If there is anything that we can be sure of it is that the promise will be kept. God is faithful. God cannot lie. God has sworn an oath by the greatest thing possible – Himself.
If you do not receive a reward from God it will not be because He broke His word. That is impossible. It will be because you did not meet the conditions. He uses Abraham as an example. Abraham received a promise from God and waited twenty-five years before he saw it fulfilled.
Do you ever doubt that God is going to keep up His end of the bargain? Abraham waited a long time before he saw the promised son born and he died never having seen the Messiah that was promised and for which he also waited (Hebrews 11:39).
Are you willing to serve Christ here knowing that your reward will not come before you die? Do you believe that God will not lie to you? Do you work with joy because you really believe that God has in store for you a reward that is magnificently great and worth dying for; worth living all your life and not seeing the reward this side of glory? Must you see God come through now in this life in order for your faith to remain? Then you have no real faith at all. You need to get to know God better.
“Waiting patiently” does not mean for a week or a year. It means a lifetime. If you serve God for the benefits you receive here you are going to be disappointed. Of course there is the peace with God, the joy of sins forgiven, the satisfaction of living a God pleasing life, the wonder of grace, and the wonder of helping someone come to know the Saviour. These things grip us daily and they are rewards beyond description.
But they are not the rewards that this text is talking about and they are not the rewards that we are called to patiently wait for. We wait for our reward with great joy because we know that God is faithful.
The teaching that says that God never desires for you to be sick and will make you materially rich is a curse from the pit. It is a denial of the self-denial that we are called to. It is a surrendering up of the permanent which is far better, for the temporary which is to be burned up in a fervent heat. We an do immeasurably better than the trinkets and bobbles that those who sell this snake oil have to offer.
Persevere to the end dear ones. We are going to inherit the promises. God has said so and that is enough for us.