Tears are interesting because they're a distillation of all the desperation, pain, and suffering one endures. They can definitely be pure, but I think they're mostly impure -- they also (can) contain instances of happiness, joy, and hope. All these experiences overflow in what we call tears.
One message I can take from Good Friday (there are many) is the message of trust. Faithful trust. Even if one doesn't believe in Jesus, one cannot deny His trust in God (even if one doesn't believe there is a God). How do I trust?
His trust in God allowed Him to undergo painful suffering for the benefit of others (us). Does my trust in anything, which manifests in the actions and decisions I make, do the same? Does my trust in whatever I trust in (e.g. my hard work, my skill set, my trust in people, ideas, concepts, or even my own personal trust in God) work for the benefit of others?
And in this thought, suffering is given a meaning. There's no question in that. One can ambiguously give meaning to anything actually (some more rigorously proved than others). At this is the core of the human existence. So trust isn't as benign a topic from the fundamental questions of the human experience. Because what you trust in (say, yourself for instance) can not only be the starting point of your reasonings, but it could also be your detriment/benefit. Subsequently then, one's trust can also be a factor for another person's overall experiences.
