Therefore, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labour is not in vain in the Lord.
NASB 1995
Therefore, my beloved brethren, be steadfast, immovable, always abounding in the work of the Lord, knowing that your toil is not in vain in the Lord.
RVR 1960
Así que, hermanos míos amados, estad firmes y constantes, creciendo en la obra del Señor siempre, sabiendo que vuestro trabajo en el Señor no es en vano.