"That which is unique and worthwhile in us makes itself felt only in flashes. If we do not know how to catch and savor the flashes we are without growth and without exhilaration." - Eric HofferAnd
"Men thin away to insignificance and oblivion quite as often by not making the most of good spirits when they have them as by lacking good spirits when they are indispensable." - From Far From the Madding Crowd by Thomas Hardy.It's important that we build on our moments of inspiration. We can act immediately on our thoughts. We can also preserve our ideas and musings by writing them down. Your journal doesn't have to be a diary, and your entries don't need to be long and formal. Instead, use a journal more as a scratch book where you can write anything that catches your imagination. That could be words, phrases, sentences, or quotes. Or even a recipe, or driving directions, or whatever.
When you review your journal, in addition to new ideas, you'll find that similar thoughts and ideas pop up. We know how we want to live, what values to live by. But we forget constantly, and thus we need reminding constantly. A journal is a tool that reminds you of your most important ideas and values.