"Say them often as they can be life-transforming and -enhancing. Be careful to use them ONLY if you truly feel mahalo or aloha within. Do not exploit these words for personal gain, and neither cheapen, nor trivialize their use by verbalizing them carelessly or without sincerity.
Aloha and mahalo are ineffable, indescribable, and undefinable with words alone; to be understood, they must be experienced.
Deeper meaning and sacredness is hinted at by the root words of these words. Linguists differ in their opinions as to the exact meanings and origins, but this is what was told to me by my kupuna (elder):
On a spiritual level, aloha is an invocation of the Divine and mahalo is a Divine blessing. Both are acknowledgments of the Divinity that dwells within and without."