I am looking for a saying to express a situation that one is apt to apply anything instantly when it is at hand. I do not remember the saying. It seems to be that 'you will find nails everywhere when you have got a hammer'. I know it was used in some article of the US. What is the original saying?
For the saying, I think it implies that it is always easy for anyone to find an excuse for doing something. Does it sometimes mean that?