A forest in a dream usually represents the unknown -- parts of your mind or your life you haven't mapped out yet. Wandering among the trees without a clear path can mirror a real situation where you're unsure which way to go, while finding a clearing often signals that some clarity is starting to emerge from the uncertainty.
The qualities of Saturn and Mars are not made better by their Conjunction; being mixed so together, they are confounded, and hurt very much. - William Lilly (1602.-1681.)