The one slogan that is good to remember is 'Now or never'. If we are not able to use the thought we have immediately we will never be able to, because the strength of the thought begins to gradually reduce till it doesn't seem important anymore. Also there might not be enough time for you in the future. Think of something that you want to do and take a thought, 'if I do it now it will happen or it can never happen.' When you think in this way you will not postpone but do what is required immediately.