וַיִּגְדַּ֖ל שְׁמוּאֵ֑ל וַֽיהוָה֙ הָיָ֣ה עִמּ֔וֹ וְלֹֽא־הִפִּ֥יל מִכָּל־דְּבָרָ֖יו אָֽרְצָה׃
And Samuel grew, and the LORD was with him, and did let none of his words fall to the ground.
Read Kabbalistic (mystical) interpretations of I Samuel 3:19: Zohar and classical Jewish mystical sources, free online.