God promised us eternal life and because we know that he does not lie there is no doubt that if we follow the path he asked us to choose, abide by his commandments and his teaching we shall experience eternity.
One of God’s first promise to us his that he told us that he loves us so much that he allowed his son to die and said if we believe in him, we shall have eternal life.
John 3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
Psalm 1 King James Version (KJV) Blessed is the man that walketh not in the counsel of the ungodly, nor standeth in the way of sinners, nor sitteth in the seat of the scornful. 2 But his delight is in the law of the Lord; and in his law doth he meditate day and night.3 And he shall be like a tree planted by the rivers of water, that bringeth forth his fruit in his season; his leaf also shall not wither; and whatsoever he doeth shall prosper.4 The ungodly are not so: but are like the chaff which the wind driveth away.5 Therefore the ungodly shall not stand in the judgment, nor sinners in the congregation of the righteous.6 For the Lord knoweth the way of the righteous: but the way of the ungodly shall perish.