Remember - Enter into a serious consideration of your state.
How thou hast received - With what joy, zeal, and gladness ye heard the Gospel of Christ when first preached to you.
Hold fast - Those good desires and heavenly influences which still remain.
And repent - Be humbled before God, because ye have not been workers together with him, but have received much of his grace in vain.
If therefore thou shalt not watch - If you do not consider your ways, watching against sin, and for opportunities to receive and do good.
I will come on thee as a thief - As the thief comes when he is not expected, so will I come upon you if ye be not watchful, and cut you off from life and hope.