Think about whatever is pure

“Finally, brethren, whatever is true, whatever is honorable, whatever is right, whatever is PURE, whatever is lovely, whatever is of good repute, if there is any excellence and if anything worthy of praise, dwell on these things.” (Phil. 4:8 NASB)

Pure: free from anything of a different, inferior, or contaminating kind; containing nothing that does not properly belong; free from moral fault or guilt; unmixed, unadulterated, undefiled, untarnished, immaculate, unpolluted, uncorrupted.

Purify yourself as He is pure

“And everyone who thus hopes in him purifies himself as he is pure.” (1 John 3:3 ESV)

By your obedience to the truth

“Having purified your souls by your obedience to the truth for a sincere brotherly love, love one another earnestly from a pure heart.” (1 Peter 1:22 ESV)

Love that issues from a pure heart

“The aim of our charge is love that issues from a pure heart and a good conscience and a sincere faith.” 

Therefore…

“So flee youthful passions and pursue righteousness, faith, love, and peace, along with those who call on the Lord from a pure heart.” (2 Tim. 2:22 ESV)