Excuse is a one single thing that stop you from doing a good thing for youself and for the society.
If you don't want to do one good thing then you can come up with many excuses for not doing it, but you just need one good reason to do it.
By nature human brain seeks easier solution and excuse is the outcome of that nature. 'I am too busy to do it, have no time' is one common excuse. One more frequently used excuse is 'every one else is doing it, hence I will do it'. When it comes to actions, we don't want to do anything different and better than the others; but when it comes to end result we want better than anyone else.
We need to understand one thing, what we give is what we get. If we don't give 'outstanding' input (through our efforts), then we will never get 'outstanding' output. If we keep on finding excuses for not doing great work then system will also excuse us from its list of top achievers.
So its our choice, which side do we want to be on, and please don't try to find new excuse for not picking a correct choice.