It seems that the first sin was that of Lucifer’s in Isaiah 14 : 12-14 where pride and selfish ambition blinded him to his fatal error of challenging Almighty God. I believe that humility
is the natural response to being close to someone far greater than oneself.  If we keep a close relationship with Jesus Christ by keeping in His Word, humility reigns. How can we measure up to such Wonderful Perfection? If we allow sin  to distance us from God, pride is the natural response of the heart.  Lucifer must have strayed away . Stay close to the Lord.  Pride just seems so unsensible there.
IPeter 5: 5b. “… God resisteth the proud, but giveth grace to the humble.”