"Whereof the Holy Ghost also is a witness to us: for after that he had said before," (Hebrews 10: 15)
Many people rely on strings tied their fingers, or sticky notes on their desk to remind them of important events or responsibilities.
Today, because we are in Christ, we have His Spirit, which reminds us of our standing before God:
"For ye have not received the spirit of bondage again to fear; but ye have received the Spirit of adoption, whereby we cry, Abba, Father." (Romans 8: 15)
"And because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father." (Galatians 4: 6)
The Holy Spirit also prays within us, and invites us to pray with Him:
"26Likewise the Spirit also helpeth our infirmities: for we know not what we should pray for as we ought: but the Spirit itself maketh intercession for us with groanings which cannot be uttered. 27And he that searcheth the hearts knoweth what is the mind of the Spirit, because he maketh intercession for the saints according to the will of God." (Romans 8: 26-28)
The Spirit also reminds us of all the things which Jesus has taught us about who we are in Him:
"But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you." (John 14: 26)
"20But ye have an unction from the Holy One, and ye know all things." (1 John 2: 20)
" 27But the anointing which ye have received of him abideth in you, and ye need not that any man teach you: but as the same anointing teacheth you of all things, and is truth, and is no lie, and even as it hath taught you, ye shall abide in him." (1 John 2: 27)
Today, we have the Holy Spirit within us, our witness of all that we have and all that we are in Christ.