Mental prayer in my opinion is nothing else than an intimate sharing between friends; it means taking time frequently to be alone with Him who we know loves us. The important thing is not to think much but to love much and so do that which best stirs you to love. Love is not great delight but desire to please God in everything.
Our uniqueness makes us special, makes perception valuable - but it can also make us lonely. This loneliness is different from being 'alone': You can be lonely even surrounded by people. The feeling I'm talking about stems from the sense that we can never fully share the truth of who we are. I experienced this acutely at an early age.
Nothing in this world can take the place of persistence. Talent will not: nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not: the world is full of educated derelicts. Persistence and determination alone are omnipotent.