3 Because you have the knowledge that the testing of your faith gives you the power of going on in hope;

4 But let this power have its full effect, so that you may be made complete, needing nothing.

3 Sachant que l'épreuve de votre foi produit la patience.

4 Mais laissez la patience accomplir parfaitement son oeuvre, afin que vous soyez épanouis et remplis, ne manquant en rien.