How can you be sure it's God speaking? There are "many kinds of languages in the world" (1Co 14:10). "Do not believe every spirit, but test the spirits to see whether they are from God" (1Jn 4:1). Fortunately we have "the Spirit of truth" (Jn 14:17) in us. With the Holy Spirit there is no guesswork. "You will know the truth'" (Jn 8:32) convincingly. Communication that comes abruptly and disturbs is not from God. Instructions demanding to do something quickly before it's too late are not God's. "God is not a God of confusion" (1Co 14:33).
Because the Spirit is in you, guidance speaks as "deep calls unto deep" (Ps 42:7). A higher plateau of interaction exists because God says "'I will make all My mountains a road, and My highways will be raised up'" (Isa 49:11). You become aware of what to expect ahead of time. Reminders may come regularly as inner assurances or observable confirmations. Long-term conviction will persist and it may grow as evidence of anticipated fulfillment. With Abraham "the Lord appeared to Abram" (Ge 12:7), "the Lord said to Abram" (13:14), Melchizedek "blessed him" (14:19), "the Lord came to Abram in a vision" (15:1) and "the word of the Lord came to him" (:4). It must transpire "according to that which had been spoken" (Ro 4:18). It is for today because "it is those who are of faith who are sons of Abraham" (Gal 3:7) and "blessed with Abraham" (:9).
"All of you who were baptized into Christ have clothed yourselves with Christ" (Gal 3:27). You have "laid aside the old self" (Col 3:9) and have "put on the new self" (:10). This is only possible with the help of the Holy Spirit. "The mind set on the Spirit is life and peace" (Ro 8:6). It is activated by those who "set their minds on . . . the things of the Spirit" (:5). You then serve in the "newness of the Spirit" (7:6). The result is "the fruit of the Spirit" (Gal 5:22).
"You are saved, if you hold fast" (1Co 15:2) to "the gospel which I preached to you, which also you received, in which also you stand" (:1). Initially it is with that "same spirit of faith . . . we also believe" (2Co 4:13). "God was causing the growth" (1Co 3:6). It demonstrates that "your faith would not rest in the wisdom of men, but on the power of God" (1Co 2:5). Then we are to "stand firm in the faith" (1Co 16:13). In a human way you get tired when you stand or hold on to something for a long time. But God handles that too. It is "He who establishes us" (2Co 1:21). "In your faith you are standing firm." (:24). Therefore it is God giving you the faith to stand.
You then become aware that you "walk by faith, not by sight" (2Co 5:7). It's possible to "take pride in appearance, and not in heart" (:12). But you live by what is in your heart. This is no surprise because God "gave us the Spirit in our hearts" (2Co 1:22). Then "your faith grows" (2Co 10:15). You can depend on God's help because he "is faithful, through whom you were called" (1Co 1:9). There will be challenging moments but "God is faithful, who will not allow you to be tempted beyond what you are able" (1Co 10:13). Monitor your standing and "test yourselves to see if you are in the faith" (2Co 13:5).