jarh naam ratan govind paa-i-aa har milay har gun sukhghanay.
Adorned with the jewel of the Naam, one obtains the Lord of the Universe; he meets the Lord, sings the Glorious Praises of the Lord, and obtains all sorts of comforts.
gur sabad paa-i-aa har naam Dhi-aa-i-aa vadbhaagee har rang har banay.
He obtains the Word of the Guru's Shabad, and he meditates on the Name of the Lord; by great good fortune, he assumes the color of the Lord's Love.
ਹਰਿ ਮਿਲੇ ਸੁਆਮੀ ਅੰਤਰਜਾਮੀ ਹਰਿ ਨਵਤਨ ਹਰਿ ਨਵ ਰੰਗੀਆ ॥
har milay su-aamee antarjaamee har navtan har nav rangee-aa.
He meets his Lord and Master, the Inner-knower, the Searcher of hearts; His body is ever-new, and His color is ever-fresh.
ਨਾਨਕੁ ਵਖਾਣੈ ਨਾਮੁ ਜਾਣੈ ਹਰਿ ਨਾਮੁ ਹਰਿ ਪ੍ਰਭ ਮੰਗੀਆ ॥੨॥
naanak vakhaanai naam jaanai har naam har parabh mangee-aa. ||2||
Nanak chants and realizes the Naam; he begs for the Name of the Lord, the Lord God. ||2||
Translation by Dr. Sant Singh Khalsa
In plain words
The golden body-horse is saddled with gold and adorned with the jewel of the Name.
Wearing that jewel, a heart meets the One and finds every comfort.
By good fortune it takes on the color of love — ever-fresh, never dull.
The best thing to adorn yourself with is the jewel of goodness, worn on the inside — and it never gets dull.
The deeper layer
"The golden body is saddled with the saddle of gold, adorned with the jewel of the Name." The best 'decoration' for the body-horse isn't outer finery but the jewel of the Name — goodness worn on the inside. And again the ever-fresh color: "His color is ever-new, ever-fresh" — love never grows stale or boring. For a child: the best thing to adorn yourself with is the jewel of goodness, worn on the inside.