Pure

means,

Clean and clear;
Free from sin and corruption.
Free from moral defilement; holy.
Also: genuine; real; true; incorrupt.
(as, 'pure religion'
James 1:27)

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.

Phillipians 4:8