Cogito Ergo Sum
Descartes famous quote. I like to modify it slightly to
“In your mind the word can’t should not exist”.
Where we are in life is really all about the place we stop and look at things. Our sense of victory or defeat is really defined by how and when we look at it. Our attitude to the problem often prevents us finding the solution.
I think therefore I am should really be a motivation to say I think I can therefore I will. Most often in life we approach things believing that we cannot do it instead of the opposite.