Saul had humanistic values. He was not looking to God for his help. David looked to God, and had spiritual values. This is why David had numerous victories, while Saul's life was full of failure.
Unfortunately, this is untrue. Success is a form of blessing, and God often blesses His followers this way, but we must never forget the folly of Eliphaz. Black and white my foot. Gray's the way. The Bible is full of "contradictions" that merely point out that we need balance. There are some absolutes, but there are most definitely "gray" issues.
Our speaker attended a Christian university against his parents' blessing -- they refused to pay for his attendance there. He got through all right, though. On graduation, he began working at a law firm and discovered that it was not something he wanted to do. I assume. He claims God closed the door. I infer, from his wording and tone, that he found that the work did not suit him. But it left him quite lost, unsure of where it was that he *should* be.
His sister "lost" her Germany missions opportunity, but soon thereafter went off to Vienna. It is amazing how God's plans surprise us sometimes.
He grew up in a Christian home, and his parents always told him that God always gives His best to those who leave the choice to Him. It is quite true, unless one misinterprets it. Good thing we have that clarification from the speaker. Oh, he didn't. I suppose he assumes his audience is listening intently -- and intelligently. But since this is a liberal arts college, I'm not so sure about that second one. And given that chapels are mandatory, I'm not sure everyone's listening terribly closely. Oh, woe to the cursed soul that condemned them to this! When one listens with half an ear to something, that something can become another something quite different from the original something.
But in any case, God is pretty darn smart. Omnicient, even. And He's pretty powerful. Omnipotent, even. Probably a good thing to trust in.