"And without faith it is impossible to please Him, for whoever would draw near to God must believe that He exists and that He rewards those who seek Him." Hebrews 11:6
Lots can be said about what a "reward" from God is. The chief end of God is to glorify Himself. The chief end of man, then, should be to glorify God, too.
One of the joys of being a Christian is knowing that God works through us to fulfill His purposes. Christians en"joy" being a part of His loving and eternal plan. The reward is the joy, but the glory goes to Him.
If we glorify Him, how do then get rewards? Because we are co-heirs with Him.
"And if you are Christ’s, then you are Abraham’s offspring, heirs according to promise." Galatians 3:29
God glorifies Himself and rewards Himself, we, as co-heirs, receive the rewards as well.