Below are links to resources on Assurance (of faith and salvation) that are useful, with a short description of each.
Book VI: That the work of grace, wrought in us by
the Spirit of God in regeneration, is… Chapter 13, Thomas Goodwin
For if the work were never so good and sound, your confidence must not be upon that, much less when it may be a false one; but this I say, renew the same acts of faith, and trust on the same God and Christ thou deal withal at first. Have recourse to them afresh, reiterate again and again thy faith on them immediately, as thou didst at first. In the original it is ‘the subsistence of your confidence,’ hold God and Christ afore thee as subsistent by faith to thee in thy treaties with them; and if God continues to carry on thy heart thus to pursue after him, Christ cannot but save thee. For if thou continuest to cast thyself upon him, and still in all such disceptations about thy estate pliest him, and puttest thy salvation into his hands, Christ will not, cannot, depart from thee whilst he continues thy heart to trust him. He cannot but work savingly in the end on such a soul, if he hath not done it already. Remember then whence you are fallen, and do your first works and repent: Heb 6:11, ‘And we desire that every one of you do shew the same diligence, to the full assurance of hope unto the end.’ If you have slackened (as you have done), yet revive that diligence again, and you will find your first confidence will come in again, if true, with advantage and increase, even with full assurance of hope unto the end; or if there was not a true faith at first, then a better will come in the room of it.
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Standing Before God, This We Are and No More 