Simply Let Your 'Yes' be 'Yes' & Your 'No' 'No'

 Suiw]:Suiw]:yUw];yUw];eS'pn]hG]:An]!sG]:'@SUnn].wL:!sG]:eAL:'@n}eSEl:'

An]!Am],sG]:'@SUnn].wL:!Am],sG]:KL:'@n}kUv];tL."

37All you need to say is simply ‘Yes’ or ‘No’; anything beyond this comes from the evil one.(Mtt.5:37)

12Above all, my brothers and sisters, do not swear—not by heaven or by earth or by anything else. All you need to say is a simple “Yes” or “No.” Otherwise you will be condemned. (James 5:12)

As for me I understand that: 

"Lord Jesus has asked or required us to be honest. Just simply say or act what we have in mind. Don't pretend. No hypocrisy. (i.e. if we felt, knew, or decided something in mind, 'Yes' say Yes', don't say 'No'. In contrast if it was 'No' then say 'No', don't say 'Yes')." 

Of course we are all liars. However, we should exert our every effort to be in likeness of Christ, to walk in the Truth, and to live by the Holy Spirit.

³⁷Suiw]:Suiw]:yUw];yUw];eS'pn]hG]:An]!sG]:'@SUnn].wL:!sG]:eAL:'@n}eSEl:'An]!Am],sG]:'@SUnn].wL:!Am],sG]:KL:'@n}kUv];tL."ngk]:eSn}.kU:siUc].kU:An]nn].'pQn]An]luk].tI:ha}.miUk]:nn].mL;lgn].lgn].yw]." (mqt]:tiw];5;37')

¹²lUiw]eSn}.tc];SQc]:nn].'pI:Aa}:pI:nac];ngc].sa};ngc].yic];kw]AUiv];'yL,eptUic],kGam];kin],Sc]lL;lL;'yL,epAw]mUic];kac]haw]Am],nn]Aw]lin]mUic];kin],'Am],nn]ekL:Aw]tac],sUiw].tac]mQw];kin],lL;lL;"nG];kL:An]SUlUw],l}:lat]:tc];SQc]:n}.pQn]An]Suiw]:Suiw]:yUw];yUw];eSwL:'!sG]:eAL:'@Am],nn]ekL:'!Am],sG]:KL:'@n}nn].kUv];yw]."epL;Am],nn]Et.SUetl}:Kam],tac];ES.Sgm];En;SG],eAL:"(kYQm];5;12')

2pI,tUiw],1;2-10'

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lgc]:mk];mn]:pn]ekL.l}:hgc].Aw]w}.El:lUik]:kQp];w}.

³AL,nL,yG],Tgt]:mYat]:mn];sw]:n}.'pn]hw];w}.kU:sUiw].kU:pUic]kL:An]hw];lUw],tL,yU,Sw];ASak]:PwemLsgm];JPL;'lUv]:An]hw];hU.sk];mn];sw]:ekL.hgc].Aw]hw];mL;lt];Pan],lUv]:Puc];yG],hUc]hac];tc];lgc]:lImn];sw]:nn].eAL:"⁴lUv]:sUiw];n}.eSmn];sw]:pn]hw];w}.ktimn];sw]:An]yG],lUc]nL,nL,El:kL:Kn]yG],nL,nL,nn].tc];nm]yw].'nc],huiw]El:sgm];lUv]:sUiw];nn].eS'SUetsac]:Kw]:hUm];pL;sgm];nG];SPL,wfic]:tuin];pQn]yG],Tgt]:mYat]:sw]:'eSEl:pa}:lgt]:tac];mUik]:kUt].sp];Pit];nG];mUic];km],PL,elL;k'mQw];An]kac]sG]tG];mgc];KG]:l}:ha}.mUik]:Kw]hQt];pQn]nn].eAL:"

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¹⁰kgp]:n}El:'pI:A}:pI:nac];ngc].sa};ngc].yic];kw]tc];la}AUiv];'kL:nc],pQn]l}:nn].Kt];sG]hQt];mk];mn]:pn]lgc]:l}:hgc].Aw]SUEl:lUik]:kQp];SUw}.nn].tL."pUiw]:wL:epL;SUhQt];sUiw];n}.kGL,suic]'SUetAm],hgn],tgn].Kuiw]:luit];lUm].eSpgk]:'¹¹El:Aik],SUetl}:An]hUm]sUm];hp].tgn]:nG];tac];mI;yG],lUic],lIeSAw]Kw]:mUic];ehLKm];TL,wrL.'An]pQn]mUic];ehLKm];sw]:hw];El:PU:Ek,Kzt]:hw];sw]:ey,SuKrit]:nn].eAL:"

2 Peter 1:1-21

2Grace and peace be yours in abundance through the knowledge of God and of Jesus our Lord.

Confirming One’s Calling and Election

3His divine power has given us everything we need for a godly life through our knowledge of him who called us by his own glory and goodness. 4Through these he has given us his very great and precious promises, so that through them you may participate in the divine nature, having escaped the corruption in the world caused by evil desires.

5For this very reason, make every effort to add to your faith goodness; and to goodness, knowledge; 6and to knowledge, self-control; and to self-control, perseverance; and to perseverance, godliness; 7and to godliness, mutual affection; and to mutual affection, love. 8For if you possess these qualities in increasing measure, they will keep you from being ineffective and unproductive in your knowledge of our Lord Jesus Christ. 9But whoever does not have them is nearsighted and blind, forgetting that they have been cleansed from their past sins.

10Therefore, my brothers and sisters, make every effort to confirm your calling and election. For if you do these things, you will never stumble, 11and you will receive a rich welcome into the eternal kingdom of our Lord and Savior Jesus Christ.