The Mantras of Hinduism were grasped intuitively from the Ether, by the Seers,Rishis.
As such they have mystical properties in them.
They deliver results whether you know their meaning or not, for Fire will burn you whether you know it or not.
It helps to know the meaning for the spiritually inclined.
And for the disbeliever, the mantras are nothing more than gibberish, at most inane statements.
When one reads the meaning of he Gayatri Mantra, it is not profound, but the results it delivers are unimaginable, when intoned properly.
Some Mantras and Stuthis contain scientific facts.
One such is the Krishna Stuthi, which contains the value of Pi to thirty-one decimal points.
The Krishna Stuthi.
gopi bhagya madhuvrata
srngiso dadhi sandhiga
khala jivita khatava
gala hala rasandara
While this verse is a type of petition to Krishna, when learning it one can also learn the value of pi/10 (i.e. the ratio of the circumference of a circle to its diameter divided by 10) to 32 decimal places. It has a self-contained master-key for extending the evaluation to any number of decimal places.
The translation is as follows:
O Lord anointed with the yogurt of the milkmaids’ worship (Krishna), O savior of the fallen, O master of Shiva, please protect me.
At the same time, by application of the consonant code given above, this verse directly yields the decimal equivalent of pi divided by 10: pi/10 = 0.31415926535897932384626433832792. Thus, while offering mantric praise to Godhead in devotion, by this method one can also add to memory significant secular truths.
(explanation: go/ga =3, pi/pa =1, bhag =4, ya =1, ma =5, dha =9, ra =2, ta =6 and so on.)
The code used is as follows:
The Sanskrit consonants
ka, ta, pa, and ya all denote 1;
kha, tha, pha, and ra all represent 2;
ga, da, ba, and la all stand for 3;
Gha, dha, bha, and va all represent 4;
gna, na, ma, and sa all represent 5;
ca, ta, and sa all stand for 6;
cha, tha, and sa all denote 7;
ja, da, and ha all represent 8;
jha and dha stand for 9; and
ka means zero.
Vowels make no difference and it is left to the author to select a particular consonant or vowel at each step.
This great latitude allows one to bring about additional meanings of his own choice. For example kapa, tapa, papa, and yapa all mean 11. By a particular choice of consonants and vowels one can compose a poetic hymn with double or triple meanings.