Your shield… your reward: Abram needed a shield, because he expected to be attacked. He needed reward, because he had denied himself great reward offered from the king of Sodom (Genesis 14:21-24).
i. God told Abram that though he had sacrificed for His sake, he would not be the loser for it. God would more than make up what Abram gave unto the LORD.
ii. God knows how to become the answer to our need. When we need a shield or a reward, He becomes those things for us. “I do not think that any human mind can ever grasp the fullness of meaning of these four words, ‘I am thy reward.’ God himself the reward of his faithful people” (Spurgeon).
iii. “If God be our reward, let us take care that we do really enjoy him. Let us exult in him, and let us not be pining after any other joy.” (Spurgeon)