Book of 1 John Chapter 2 Vs. 10

 The New Commandment

1 John 2:10 “He that loveth his brother abideth in the light, and there is none occasion of stumbling in him.”

He that loveth... A man that truly loves his brother has proof of his Christian experience, and if he continues to love he will not stumble over his brethren.

abideth in the... means to continue to live. Love is a product of Light. There is no temptation to steal from your brother, if you love him. There is no desire for things that your brother owns, if you love him.

Abideth μένει

To abide in God is a more common expression with John than to be in God, and marks an advance in thought. The phrase is a favorite one with John. See John 15:4 sqq.; John 6:56; 1Jhn. 2:24, 2:27, 2:28; 3:6, 3:24; 4:12 sq.; 4:15 sq. Bengel notes the gradation in the three phrases to know Him, to be in Him, to abide in Him; knowledge, fellowship, constancy.

occasion of stumbling... Greek: proskomma. Translated stumbling (1Pet. 2:8); stumbling Block (Rom. 14:13; 1Cor. 8:9); and offence (Rom. 14:20).

occasion of stumbling (σκάνδαλον)

See on offend, Mat. 5:29. For the image in John, see John 6:61; 11:9; 16:1; Rev. 2:14. The meaning is not that he gives no occasion of stumbling to others, but that there is none in his own way. See John 11:9, John 11:10.

These are just two examples, but you can see that loving your brother causes you to have no desire to do him harm in any way. The lust of the flesh causes sin. The Light of God helps us see things more clearly and causes us not to lust.

He who truly loves not he that saith, verse 9, abideth in the light, that is, the presence of God. He does not stumble, nor does he cause others to stumble. John stresses actions, not mere words.

By contrast, whoever loves his brother lives in the light of the new Age which has dawned in Christ (cf. 1Jhn. 2:8). There is nothing in him in one who loves his brother to make him stumble. Hatred is a kind of internal stumbling block which can lead to disastrous spiritual falls. But the calamities to which hatred leads are avoided by one who loves his brother.