This is a recipe for a sad life. It's avoiding friendship for the fear of betrayal. You get a lot of benefits by being good friends with colleagues. There are, however important things to be aware of:

1- "Though shall not" limit their social life to their colleagues (or any single group that can disappear with a divorce, change of jobs, or hobby, maybe because of an incident).

2- "Though shall not" blindly help people with the hope of being helped in return. Help with generosity, but know the limits: don't sacrifice yourself, and certainly, don't count on people returning the favor as your main plan. It's incredible how much happier we can be just by helping people, if we fire and forget, rather than cling onto.

3- Do not define yourself with your job, your success in there, or with your colleagues' approvals. This is extremely hard, yet extremely important. Diversify what defines you. Be able to mentally afford being bad at some of them. Don't let any of them define who you are. This lets you act with true confidence (not insecurity disguised as overconfidence), which is extremely pleasant for yourself and others.