If you look for truth, you may find comfort in the end; if you look for comfort you will not get either comfort or truth only soft soap and wishful thinking to begin, and in the end, despair.
C. S. Lewis
Wishful thinking is not idealism. It is self-indulgence at best and self-exaltation at worst. In either case, it is usually at the expense of others. In other words, it is the opposite of idealism.
Stop the habit of wishful thinking and start the habit of thoughtful wishes.
Wishful thinking is one thing, and reality another.
Wishful thinking is not sound public policy.