One should also expect it to take time. Perhaps the best analogy I've heard is that trust is a glass jar -- it can be slowly diminished or emptied out all at on

One should also expect it to take time. Perhaps the best analogy I've heard is that trust is a glass jar -- it can be slowly diminished or emptied out all at once (or the jar could indeed shatter), but absent extreme circumstances, the way in which it is usually built is by adding one marble of trust at a time and without doing anything to damage the trust until the jar is full.