"All journeys have secret destinations of which the traveler is unaware"

The quote means that every journey that a person starts has concealed or unidentified destinations that they might not be aware of before they begin. It recommends that life has plenty of unexpected twists and turns and that we can not constantly predict where our path will take us. It encourages us to welcome the unidentified and be open to the unforeseen opportunities and experiences that may come our way.