The practice has been painful of late. And, yet, I know it is worthwhile. I can see my mind thrashing about, trying to justify breaking a precept or, at the very least, breaking my commitment to brahmacariya. I went searching for and found the verses of the Lord Buddha that sprang to mind. May they be of benefit!
“And what is the taking on of a practice that is painful in the present but yields pleasure in the future? There is the case of a person who is normally strongly passionate by nature and frequently experiences pain & grief born of passion; a person who is normally strongly aversive by nature and frequently experiences pain & grief born of aversion; a person who is normally strongly deluded by nature and frequently experiences pain & grief born of delusion. Even though touched with pain & grief, crying with a tearful face, he lives the holy life that is utterly perfect, surpassingly pure. With the break-up of the body, after death, he reappears in the good bourn, the heavenly world. This is called the taking on of a practice that is painful in the present but yields pleasure in the future.”
https://www.accesstoinsight.org/tipitaka/mn/mn.045.than.html
Cattāri Brahmavihārā 
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