Material things loses its value and can be stolen.

Loyalty, honesty, obedience, integrity and love has great value that no man can steal, nor does it lose its value.

Your treasure is where your heart is.

Matthew 6:20-21 (KJV) – but lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal: for where your treasure is, there will your heart be also.