A mind filled with negative thoughts is like a beautiful garden full of weeds. The weeds destroy everything in the area and spread very quickly when not removed.
If you want to succeed, enjoy happiness and live a life of abundance, and prosperity - you have to eliminate any consistent negative thinking and negative beliefs. You need to destroy the weeds in the garden of your mind. Pull them out as fast as they get in and replace them with beautiful flowers
Don’t allow anyone to plant weeds in your garden, not even you.
Tend to the garden of your mind. Discover and begin removing the weeds of negative and limiting thinking. Replace these weeds with new seeds - of positive thinking, positive feelings and positive living.
Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things. Philippians 4:8
Positive thoughts are not enough. There have to be positive feelings and positive actions.