A sunny disposition is worth ...

A sunny disposition is worth more than [a monetary] fortune. Young people should know that it can be cultivated; that the mind like the body can be moved from the shade into sunshine.
A sunny disposition is worth more than [a monetary] fortune. Young people should know that it can be cultivated; that the mind like the body can be moved from the shade into sunshine.
 Andrew Carnegie

More phrases

Being self-made is a state of mind, and once you put that mentality to work, your success will come.
 Dave East
A lot of people change for good. Some people just fall off. Just trying to progress in anything, no matter what you're doing, I feel like any progression you make... some people aren't gonna be around you that were around you.
 Dave East
What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult.
Don't settle in the land of barely enough. That is where you are, it is not who you are. That's your location, it's not your identity. No matter what it looks like, have an abundant mentality.
Everything in your life, every experience, every relationship is a mirror of the mental pattern that is going on inside of you.

Quotes from the same author

Give me the life of the boy whose mother is nurse, seamstress, washerwoman, cook, teacher, angel, and saint, all in one, and whose father is guide, exemplar, and friend. No servants to come between. These are the boys who are born to the best fortune.
 Andrew Carnegie
The man who acquires the ability to take full possession of his own mind may take possession of anything else to which he is justly entitled.
 Andrew Carnegie
Teamwork is the ability to work together toward a common vision. The ability to direct individual accomplishments toward organizational objectives. It is the fuel that allows common people to attain uncommon results.
 Andrew Carnegie
The man of wealth [should] consider all surplus revenues which come to him simply as trust funds, which he is called upon to administer to produce the most beneficial results for the community - the man of wealth thus becoming the mere trustee and agent for his poorer brethren, bringing to their service his superior wisdom, experience and ability to administer, doing for them better than that they would or could do for themselves.
 Andrew Carnegie
Give me a man with an average ability but a burning desire to succeed and I will give you a winner in exchange every time.
 Andrew Carnegie