From there I will give her her vineyards, and make the Valley of Achor a door of hope. There she shall respond as in the days of her youth, as at the time when she came out of the land of Egypt. - Hosea 2:15

Biblical references to Valleys generally symbolize and state of hopelessness. The Valley of Achor (judgment) got it's name when Archan's family was stoned to death and Israel's armies were defeated (Joshua 7:25-26). Feeling hopeless is part of the human condition and may of history's most notable heroes experienced it:

There is scarcely anything around us but ruin and despair. - William Penn

Nothing can save the British Empire from shipwreck. - Lord Shaftesbury

In industry, commerce and agriculture there is no hope. - Benjamin Disraeli

The lamps are going out all over Europe; we shall not see the light again in our lifetime. - Lord Grey

There are fearmongers and prophets of doom everywhere, some currently saying the 3rd World War will start this year. If you buy what they are saying about anything you'll end up convinced there is no hope for your situation. When nothing could be further from the truth!

Let us hold fast to the confession of our hope without wavering, for he who has promised is faithful. - Hebrews 10:23

It is the same promise he made to his people even after they'd turned their backs on Him. He said:

As for my people who have sought me, the plains of Sharon shall again be filled with flocks, and the valley of Achor shall be a place to pasture herds. - Isaiah 65:10.

Henry Blackaby observes:

Optimists don't ignore the difficulties. . . . .but the knowledge of God's presence prevents them from becoming discouraged. . . . .It's impossible to stand in his presence and be a pessimist. If we focus on our problems they'll seem gigantic. But as we focus on God we see our situation in perspective and are assured that all things are possible.