SB 6.16.63

etāvān eva manujair
 yoga-naipuṇya-buddhibhiḥ
svārthaḥ sarvātmanā jñeyo
 yat parātmaika-darśanam
Word for word: 
etāvān — this much; eva — indeed; manujaiḥ — by human beings; yoga — by the process of linking with the Supreme by bhakti-yoga; naipuṇya — endowed with expertise; buddhibhiḥ — who have intelligence; sva-arthaḥ — the ultimate goal of life; sarva-ātmanā — by all means; jñeyaḥ — to be known; yat — which; para — of the transcendental Lord; ātma — and of the soul; eka — of the oneness; darśanam — understanding.
Translation: 
Persons who try to reach the ultimate goal of life must expertly observe the Supreme Absolute Person and the living entity, who are one in quality in their relationship as part and whole. This is the ultimate understanding of life. There is no better truth than this.