It is clear that the meaning of life is what you choose it to be. Therefore there can't be any single meaning, but happiness is a universal goal that can be achieved. But no one should be so greedy to achieve happiness at the expense of other people's happiness.
Obey the spirit more than the letter of the law. Getting away on a technicality is not the way to live your life. The scientific method can be used for everyday decisions: what will produce the best outcome?
we can measure the consequences of our actions. Tradition is no longer an excuse, it is a cop-out. Just because so many others think it, act on it, does not excuse you for being on the wrong side of history.