And now, little children, remain in Christ, so that when He appears, we may be confident and unashamed before Him at His coming. — 1 John 2:28

This is a tender command from an old apostle who knew what it was to stumble. Abiding is not gritting your teeth and trying harder; it is staying connected to the vine. The one who wavers like a wave of the sea has not learned to rest in Christ's finished work. All the promises of God are Yes in Him, so your standing does not depend on your grip. It depends on His.