My dad used to say you can convince anyone of anything if you toss a little crazy into it. If you make them believe you are crazy enough to do it, you can do it. It's funny how true I have found that. Be crazy enough to think you can succeed - and you can.
Do not sing the song you think others think you should sing.
If you want the future to be a certain way, don't just hope for it - create it.
This is another one who makes me think of my dad. Half-ass never worked in his house. Whole ass was the only option. When I'm not doing something I should be or giving it my all, my dad's voice would come into my head saying "don't do it half assed - whole ass or go home."