Romans 4:20-21

Romans 4:20-21
He staggered not at he promise of God through unbelief; but was strong in faith, giving glory to God;
And being fully persuaded, that what he had promised, he was able also to perform.

Abraham trusted that what God said he would do would come to pass. God cannot lie so we can trust with full assurance that God will follow through on his promises to us. I think some of the trouble we have is that things don't go OUR way so we think God is abandoning us. God knows what we need, it is usually not what we think we need. God will not fail you, just trust Him.