Verses about 'being positive'
Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven.
Matthew 5:16
The joy of the Lord is your strength.
Nehemiah 8:10
Rejoice in the Lord alway: and again I say, Rejoice.
Philippians 4:4
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