Determine the valence intensity of the tweeter's emotional state conveyed in the tweet "What terrible thing to see and have no vision-\n\nHelen Keller-\n\n-Begin with the end in mind-\n\nStephen Covey-\n\n #whereareugoing". Offer a numerical score between 0 and 1, where 1 represents very positive and 0 represents very negative sentiment.
0.426