Joshua 14:6-14 - Imagine being promised land from the Lord, yet because of the unfaithfulness of others, you had to wait 45 years for the opportunity to claim it. And notice in verse 12: "It may be that the Lord will be with me, and I shall drive them out just as the Lord said." The implication is that this area had not yet been captured (although it doesn't seem to match with the list in Joshua 13), yet Caleb, at 85, is ready to take it as God had promised him. I find it hard to maintain my motivation and zeal from one week to the next, let alone for 45 years.